Skip to main content

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

People that score high on psychopathic traits are less likely to yawn contagiously

Abstract

Considerable variation exists in the contagiousness of yawning, and numerous studies have been conducted to investigate the proximate mechanisms involved in this response. Yet, findings within the psychological literature are mixed, with many studies conducted on relatively small and homogeneous samples. Here, we aimed to replicate and extend upon research suggesting a negative relationship between psychopathic traits and yawn contagion in community samples. In the largest study of contagious yawning to date (N = 458), which included both university students and community members from across 50 nationalities, participants completed an online study in which they self-reported on their yawn contagion to a video stimulus and completed four measures of psychopathy: the primary and secondary psychopathy scales from the Levenson Self-Report Psychopathy Scale (LSRPS), the psychopathy construct from the Dirty Dozen, and the Psychopathic Personality Traits Scale (PPTS). Results support previous findings in that participants that yawned contagiously tended to score lower on the combined and primary measures of psychopathy. That said, tiredness was the strongest predictor across all models. These findings align with functional accounts of spontaneous and contagious yawning and a generalized impairment in overall patterns of behavioral contagion and biobehavioral synchrony among people high in psychopathic traits.

Introduction

The automatic and reflexive tendency to yawn in response to sensing the yawns of others, i.e., contagious yawning, is well-documented in humans1,2, and has been observed in a growing number of non-human species including non-human great apes3,4, dogs5, pigs6, and birds7,8, among others. Unlike spontaneous yawning, which begins in utero9, is ubiquitous across vertebrates10, and appears to be a human universal11, contagious yawning does not emerge until early childhood12,13, is limited to social species14, and psychological studies reveal considerable variability in the tendency for people to yawn contagiously. In particular, the percentage of participants that yawn in response to video and/or audio stimuli of others yawning typically ranges between 30 and 60% (e.g.1,2,15,16,17,18,19).

This variability in yawn contagion has drawn considerable attention over the last two decades (e.g.2,20,21), with numerous published works examining factors that contribute to this response. Overall, the primary emphasis of research in this area has been to explore associations between contagious yawning and empathy or emotional contagion (reviewed by22,23). The proposed link between contagious yawning and empathic processing originates from a monograph by Lehmann24, and has been elaborated more recently in its inclusion in the Perception–Action-Model (PAM) proposed by Preston and de Waal25,26. Accordingly, the motor mimicry of yawn contagion results from a perception–action mechanism that permits the rapid synchronization of states between individuals27. Extending from the PAM, contagious yawning has been proposed to represent a basic form of emotional contagion, whereby the yawns, and accompanied emotional or mental state of the yawner, are passed on to another individual22. Similarly, automatic facial mimicry is hypothesized to enhance emotional recognition28, and has been considered to be a critical feature of emotional contagion29. While the motor action pattern of yawning is clearly contagious, as referenced by works above, this theory lacks empirical evidence when it comes to the transfer of emotional states during yawn contagion23. Moreover, in general, the role of facial mimicry in the transfer of emotional states is not unequivocal30. Therefore, this phenomenon might be better explained by simple behavioral contagion or facial mimicry31,32,33. In contrast to emotional contagion, whereby the synchrony of behaviors and emotions are neurologically linked, simple behavioral contagion represents the copying of the behavior itself. Yawn contagion could be adaptive in the absence of emotional coupling in facilitating collective vigilance and coordinated group behavior23. Nonetheless, the idea that contagious yawning is perhaps reflective of empathy or emotional contagion has drawn considerable interest and investigation.

Platek et al.2 garnered initial support for a connection between contagious yawning and mental state attribution (a form of cognitive empathy) among samples of university students. These authors found that contagious yawning was positively correlated with performance on self-face recognition and faux pas theory of mind tests, and negatively correlated with measures of schizotypal personality traits. Since then, psychological studies examining associations between individual differences on empathy measures and yawn contagion have revealed mixed findings (e.g.20,21,34,35,36), with most studies reporting no clear relationship (reviewed by23). For example, in what was the largest study at the time (N = 328), Bartholomew and Cirulli20 found highly consistent individual differences in yawn contagion to video stimuli in an online format, but when accounting for the age of the participants, yawn contagion was not related to empathy as measured by the Interpersonal Reactivity Index (IRI)37. More recently, however, Franzen et al.21 conducted two large laboratory studies (N = 171; N = 333) and found that participants who yawned contagiously reported significantly higher empathy levels as measured by the IRI. Yet, in a smaller study (N = 97) published recently, contagious yawning was unrelated to the total IRI score, or any of the subscales (cognitive: perspective taking and fantasy; affective: empathic concern and personal distress)19. In sum, results from studies linking individual differences in yawn contagion to measures of empathy remain inconsistent.

As an indirect measure of empathy, studies have also examined ingroup or familiarity biases in yawn contagion. Observational studies suggest that naturalistic instances of yawn contagion appear to occur more regularly among friends and family compared to acquaintances and strangers38,39. Yet, enhanced attention towards familiar individuals and the tendency to avoid the gaze of strangers or less familiar acquaintances, could have contributed to this effect40. To date, the only experimental research to examine in-group or familiarity biases in yawn contagion among humans failed to show an effect41. Researchers have also explored gender differences in yawn contagion, as there are marked differences in empathy between men and women42. In support of this notion, Norscia and colleagues43 reanalyzed data from the aforementioned observational study38 and found that women yawned contagiously more so than men. These authors have also noted a similar effect for auditory yawn contagion39. However, an analysis across the broader literature demonstrated no differences in contagious yawning between men and women44.

Another approach to assessing the link between contagious yawning and empathy has been to study clinical populations with deficits in empathy and to assess variability in other psychological attributes predictive of empathic processing in non-clinical populations. This area of research has led to the examination of (1) group differences in contagious yawning among children with autism spectrum disorder (ASD), and (2) correlational studies measuring individual differences in psychopathic traits and the susceptibility to yawn contagiously. Individuals with ASD tend to be characterized by impairments in cognitive empathy or perspective taking (i.e., theory of mind), while psychopathic traits are associated with reduced affective empathy, including diminished primary emotions such as fear and sadness45. Interestingly, both ASD and the prevalence of psychopathic traits are more common among males46,47. These populations are also of interest to study with regards to the hypothesized functional significance of yawn contagion in promoting collective vigilance and synchronized group behavior/movement48,49,50,51,52,53. Impairments in imitation and joint attention among individuals with ASD diminish cooperation and coordinated actions54. Individuals with ASD also show diminished facial mimicry55,56 and less synchronization during interpersonal coordination57. Similarly, psychopathy is marked by deceit and a lack of cooperation58, and individuals that score high on callous-unemotional traits also display reduced facial mimicry30,59 and diminished group cohesion60. In addition, a general impairment in biobehavioral synchrony has been implicated in psychopathy61.

The first such study on contagious yawning involving individuals with ASD was conducted by Senju et al.62. Using standard laboratory procedures, i.e., the presentation of video stimuli with people yawning, children with ASD showed diminished yawn contagion—an effect that garnered significant interest in the scientific community and was subsequently replicated by Giganti and Ziello63 and Helt and colleagues64. While initially taken as strong support for a link between contagious yawning and empathy, further work refined this view showing that the diminished contagion among children with ASD results from reduced attention to yawning stimuli. When instructed to focus their attention on the eyes of the yawning target in the stimuli, individuals with ASD displayed rates of contagious yawning equivalent to aged-matched control samples (e.g.18,65). Moreover, when using eye-tracking to confirm that visual attention is allocated to the stimuli during testing, both typically developing children and those with ASD yawn more often to depictions of yawning than to control clips66. In another study, Mariscal et al.67 measured contagious yawning along with blood oxytocin levels from both children with ASD and those that were typically developing. Again, no group differences in yawn contagion were found, i.e., children with ASD yawned just as often as typically developing children. However, a positive relationship was reported between contagious yawning and oxytocin among children with ASD, while no such relationship was present in the control group. Although links between contagious yawning and oxytocin continue to be discussed68, attempts to experimentally manipulate oxytocin through intranasal administration have found no effect on yawn contagion69,70.

To date, only two studies have examined the link between contagious yawning and psychopathic traits. Rundle, Vaughn, and Stanford71 had university students (N = 135) from the United States complete the Psychopathic Personality Inventory-Revised (PPI-R)72 and watch a series of yawning videos to obtain physiologically defined measures of yawn contagion using facial electromyography and galvanic skin response. When comparing participants that did and did not yawn, there was no difference in overall scores on the PPI-R. However, when examining the individual subscales of the PPI-R, which include fearless dominance, self-centered impulsivity, and cold-heartedness, the latter predicted yawn contagion. That is, participants who scored higher on measures of cold-heartedness were less likely to yawn contagiously. Males from the sample (N = 57) also took part in an eyeblink startle paradigm, and consistent with a link to psychopathy, contagious yawning was less common in men with a lower startle response71. The negative association between contagious yawning and psychopathic traits was also recently examined by Helt et al.19. Drawing from a slightly smaller sample of university students in (N = 97) also from the United States, participants completed the PPI-R, the Autism Spectrum Quotient (AQ), and the IRI (see above). Unlike Rundle et al.71, a negative relationship was revealed between the combined PPI-R and video confirmed yawn contagion (yes/no), i.e., participants that scored higher on psychopathic traits were less likely to yawn contagiously, though no analyses were conducted across the subscales of this measure. By employing eye-tracking, the researchers were also able to show that the negative relationship between contagious yawning and scores on the PPI-R was not moderated by visual attention. A similar negative relationship was found between the AQ and contagious yawning, but unlike measures of psychopathy, the relationship between yawn contagion and the AQ was moderated by eye gaze19. Lastly, contagious yawning was not significantly correlated with total empathy or any of the subscales of the IRI.

Based on the overall mixed findings within the psychological literature, and the relatively limited investigation into the link between psychopathic traits and yawn contagion in particular, the current study aimed to provide resolution to this anticipated association. In particular, this investigation sought to replicate and extend upon the findings from Rundle et al.71 and Helt et al.19, but with a larger and more heterogeneous sample of online participants. Four distinct measures of psychopathy were included to assess the generalizability of this association, and given the importance of physiological variables in influencing yawn contagion (e.g.15,48,73,74,75,76,77,78), measures of sleep and fatigue were taken into consideration. Lastly, given recent debates on the importance of attention in contributing to yawn contagion22,23,34,65, both objective and subjective measures of attention to the contagious yawning video stimulus were included.

Results

Across all participants (N = 458), a total of 50 nationalities were identified (see Fig. 1). Descriptive statistics are presented in Table 1. Across the sample, 287 (62.7%) participants reported yawning contagiously in response to the video stimuli. These participants that reported contagious yawning scored significantly lower on three out of the four psychopathy measures (see Fig. 2), including the primary psychopathy scale from the Levenson Self-Report Psychopathy Scale (LSRPS) (U = 21,086, p = 0.012, Rank biserial correlation = 0.141), the psychopathy construct of the Dirty Dozen (U = 21,383, p = 0.020, Rank biserial correlation = 0.129), and the combined Psychopathic Personality Traits Scale (PPTS) (U = 21,453, p = 0.024, Rank biserial correlation = 0.126). There was no significant difference in the scores on the secondary psychopathy scale from the LSRPS between those that did and did not yawn (U = 24,192, p = 0.800, Rank biserial correlation = 0.014).

Figure 1
figure 1

Topographical distribution of sampled participants. Number of participants are depicted in red-scale using different categories (see legend), with an increasing number of participants per country indicated by an increasingly darker color of red. Note that some participants entered double nationalities and that 58 participants entered either a region (e.g. Asia) or ethnicity rather than nationality. This map was created using Mapchart.net.

Table 1 Descriptive statistics.
Figure 2
figure 2

Box and violin plots depicting the relationship between psychopathic trait scores and contagious yawning. Participants that yawned contagiously scored significantly lower (*p < 0.05) on (a) the primary psychopathy scale of the LSRPS, (c) the psychopathy construct of the Dirty Dozen, and (d) the combined PPTS. There was no difference between yawners and non-yawners on (b) the secondary psychopathy scale of the LSRPS. Box plots represent the median, interquartile ranges, and the whiskers extend 1.5 times the interquartile range for the upper and lower boundary, while the violin plots illustrate the distribution of the psychopathy trait scores.

Subsequent binary logistic regressions were run separately for each psychopathy measure, taking into account participant gender, age, prior sleep the previous night, self-reported tiredness, and objective and subjective levels of attention when viewing the contagious yawning stimulus. In doing so, the primary psychopathy scale of the LSRPS and the combined PPTS remained as significant predictors of yawn contagion (Table 2), i.e., those that scored higher on these measures were less likely to report yawning in response to the video stimulus (ps < 0.05). Self-rated tiredness was the best predictor of yawn contagion across all models (ps < 0.01), i.e., with yawners reporting higher ratings of tiredness during testing, while none of the following variables were significant predictors in any of the models: gender, age, prior sleep the previous night, and subjective attention. The objective measure of attention was a significant variable in the model assessing the secondary scale of the LSRPS, but not in the expected direction; participants that correctly recalled more details about the video stimulus were less likely to yawn contagiously (p = 0.046).

Table 2 Output from binary logistic regressions.

Discussion

In a large-scale conceptual replication of two previous publications19,71, the findings from this study demonstrate a small, but significant negative relationship between yawn contagion and psychopathic traits in a community sample. While these previous studies included a single measure of psychopathy (PPI-R) among university student populations in the United States, the current study assessed the generalizability of this relationship across different scales in a much larger and more heterogenous sample. Consistent with previous reports, we show that participants who failed to show contagious yawning (37.3%) tended to score higher on various measures of psychopathy, including the primary psychopathy scale of the LSRPS79, the psychopathy construct of the Dirty Dozen80, and the combined PPTS81. However, the effect sizes from these comparisons were small (Rank biserial correlations = 0.126–0.141). When considering participant gender, age, prior sleep, current tiredness, and objective and subjective measures of attention, only the primary psychopathy scale of the LSRPS and the combined PPTS remained significant, with tiredness of participants serving as the best predictor of yawn contagion across all models. Consistent with a previous review of the literature44, and replicating the findings of Rundle et al.71, we show no difference in contagious yawning between men and women.

Given that psychopathy is characterized by deficits in emotional empathy, or the ability to be affected by—or share—the emotional states of others45, the impetus for examining the connection between psychopathic traits and contagious yawning has focused on purported links between contagious yawning and empathy19,71. In particular, Rundle et al.71 found that scores on the social-emotional component of the PPR-I, i.e., cold-heartedness, negatively predicted yawn contagion. Since cold-heartedness represents the inconsideration of the emotional state of others72, this result was consistent with the notion that contagious yawning represents a basic form of emotional contagion22,24,25,26. In line this view, Helt et al.19 found an inverse relationship between combined PPR-I scores and yawn contagion, and that the overall measure of psychopathy was negatively correlated with personal distress in social interactions. Based on these findings, the authors proposed that callous and unemotional traits producing less personal distress might contribute to the inability to achieve bodily resonance with others, and that diminished yawn contagion is due to a malfunctioning of the empathic system.

With regards to the current study, the primary psychopathy scale of the LSRPS—which was the best predictor of contagious yawning from all psychopathy measures—captures indices of individual callousness, egocentricity, manipulation, selfishness, and deceit79, and is thus in line with these previous reports. The four questions within the psychopathy construct of the Dirty Dozen measure these dimensions as well80, and individuals that scored higher on this instrument were also less likely to yawn contagiously. In addition, the results revealed a significant negative relationship to the combined PPTS, which also emphasizes primary psychopathic personality characteristics81. Low internal consistency precluded the assessment of the affective responsiveness subscale of the PPTS, which is most closely related to the cold-heartedness subfactor of the PPI-R found to be significant in Rundle et al.71. However, the results did reveal a significant negative relationship to the combined PPTS. The secondary psychopathy measure of the LSRPS was the only instrument unrelated to yawn contagion. Unlike the other measures, secondary psychopathy is associated with antisociality, anxiety-driven impulsivity, and irresponsibility, and reflects more of an antisocial-behavioral dimension of psychopathy82. In particular, the PPTS was designed with the intention to place a greater emphasis on personality rather than behavior81. Thus, yawn contagion appears to be largely associated with affective-interpersonal personality characteristics.

These findings are consistent with the view that contagious yawning is associated with empathy or emotional contagion22. In line with this perspective, and as it relates to the current findings, prior works have shown that adolescent males that score high on callous-unemotional traits both score lower on self-report empathy and have reduced facial mimicry, as measured by electromyography, to empathy-inducing video clips59 and dynamic emotional expressions30. However, it is important to acknowledge that psychopathic traits only represent an indirect measure of empathy, such that yawn contagion could merely reflect a simple feature of behavioral contagion or facial mimicry31,32,33. While empathy represents a superordinate category of PAM25,26, features explained by this model, and subclasses of phenomena with the same mechanism, such as imitation and state matching, do not require empathy. This is similar to the Russian-doll model for the evolution of empathy, whereby components of empathy are layered on top of and dependent upon one another27. In this case, motor mimicry is at the core within a perception–action mechanism, but in and of itself does not reflect empathy.

Therefore, as an alternative interpretation, the characteristic features of psychopathy might represent an impairment in attachment, social affiliative behaviors, and social connectedness that affects more general features of behavioral contagion61. Consistent with the view, Helt et al.19 found a similar negative relationship between psychopathic traits and itch contagion, which is not implicated in empathic processing. In addition, a growing number of studies have found that yawn contagion does not correlate significantly with measures of empathy20,35,36. In an attempt to delineate between the role of emotional and behavioral contagion in the contagious yawning reflex, Chan and Tseng34 compared the effects of empathy, emotional processing, and detection sensitivity to yawning in typically developing populations, finding that only the latter predicts contagious yawning. This same study found that people more likely to detect yawning, but not emotional expressions, are most likely to show contagious yawning. As it relates to group dynamics, psychopathy is thought to originate from disrupted biobehavioral synchrony61, which represents the coordination of biological and behavioral processes during social contact and is considered critical for attachment, affiliative bonds, and promoting survival activities in groups83. Thus, the reduced tendency to yawn contagiously among individuals scoring high in psychopathic traits could reflect a generalized impairment in biobehavioral synchrony. Moreover, it has been theorized that contagious yawning evolved to enhance collective vigilance48,49 and coordinate or synchronize group behavior50,51,52,53, and these functional accounts for yawn contagion can explain the negative association between contagious yawning and psychopathy in the absence of emotional contagion. For example, groups characterized by higher levels of psychopathy have previously been shown to have more dysfunctional interactions and lower levels of cohesion60.

An often-neglected area of study when examining variation in contagious yawning concerns underlying physiologic and circadian factors that contribute to non-social (i.e., spontaneous) yawning. Spontaneous yawns represent the primitive feature of this stereotyped action pattern, and are physiologically driven. Contagious yawning, however, represents a derived characteristic that has appeared more recently among a select group of social species14. Since the action patterns of both yawn types appear indistinguishable, the neurological mechanisms governing yawn contagion are likely mediated by the same physiological variables affecting patterns of spontaneous yawning. In support of this view, and consistent with the hypothesis that the motor action pattern of yawning evolved to increase arousal and state change1,84 via intracranial circulation and brain cooling85,86, socially-elicited forms of contagious yawning can be modulated by different methods of breathing48, time of day74, cooling/heating to the surface of forehead and neck48,78, chewing on gum76, ambient temperature variation and seasonal climactic conditions15,73,77, and acute physical stress75. Collectively these studies support the view that spontaneous and contagious forms of yawning share fundamental mechanistic pathways87. In line with this perspective, previous research has shown that both spontaneous and contagious forms of yawning are positively correlated with subjective ratings of sleepiness74,88, and the best predictor of contagious yawning here was self-reported tiredness during testing. Thus, when assessing variation in yawn contagion, we propose more attention should be given to a combination of both psychological traits as well as internal physiologic states. Franzen et al.21 provides a good example of this approach, measuring pulse rate as an indicator of sleepiness during contagious yawning trials.

With regards to the overall levels of psychopathy reported in this study, the mean scores and measures of variability are similar to previous community samples79,80. Previous studies have also used these instruments within incarcerated populations. In comparison to a sample of male inmates in a minimum-security prison, the current levels on the LRSPS were appreciably lower, particularly for the primary measure89. In a separate study90, which used a different Likert scale, psychopathy levels on the Dirty Dozen were also significantly higher among an incarcerated population compared to a community sample. The PPTS was designed to measure psychopathic personality regardless of respondents' criminal history, but was initially measured in two incarcerated samples81,91. In this case, the levels in these previous studies were quite similar to those reported here. Thus, future research could examine whether the negative association between psychopathy and contagious yawning would replicate in clinical or incarcerated populations.

While the advantages to this study include the large sample size and relatively diverse composition, there remain limitations. The reliance on self-reported contagious yawning, rather than recording physiologic- or video-confirmed instances of yawning, as was the case in Rundle et al.71 and Helt et al.19, is a notable limitation. Unfortunately, the Covid-19 pandemic dictated the online format for this study, and prevented the possibility to obtain other measures of yawn contagion. That said, there are two reasons to remain confident in the findings presented here. First, the current results largely replicate earlier studies, an effect not expected if we had obtained inaccurate measures of contagious yawning. Second, prior research has thoroughly demonstrated that self-report is a valid measure of contagious yawning based on substantial agreement between self-report and video-confirmed yawns41,69,92. That said, only a binary measure of contagious yawning was assessed, and capturing self-reported yawn frequency could have provided an important source of variability. Another limitation to this study was the lack of a non-yawning control condition. As a result, we were unable to distinguish between spontaneous yawns that could have been reported as contagious. However, we do not view this as a major concern given prior research has shown a very low rate of spontaneous yawning in response to control stimuli (3.3%)21. Overall, this study also shares limitations with most research on contagious yawning with regards to the external validity of the contagion stimuli93. In this case, participants were shown 50 consecutive yawning clips in short duration and without sound. Thus, in the future, researchers could work to develop and incorporate more ecologically valid stimuli for contagious yawning research.

Our measures of attention were also a limitation. We found no relationship between contagious yawning and the subjective measure of attention to the video stimulus, and an unexpected inverse association between contagious yawning and the objective measure of attention. That is, participants that correctly recalled more details from the video were less likely to report contagious yawning. These findings are difficult to reconcile with previous studies showing a significant effect of visual attention to yawning stimuli on yawn contagion19,65. It is possible that rather than providing an index of attention towards yawning, as it was intended, our measure of objective attention inadvertently captured participant attention towards other aspects of the video, such as the running tally of the total number of yawns in the upper-righthand portion of the screen. Thus, participants scoring higher on this measure may have been more attuned to outside features and actually spent less time focused on yawns, which could explain the pattern of results here. Given these limitations, and the continued debate over the roles of visual attention compared to social-connectedness in contributing to contagious yawning22,34,40,65, it is recommended that future studies use eye-tracking to assess visual attention to different features of the yawning stimulus19.

In summary, the current results, which to our knowledge come from the largest and most diverse sample in the study of contagious yawning to date, show a small, but significant negative relationship between psychopathic traits and the susceptibility to yawn contagiously. Limitations notwithstanding, this study provides a conceptual replication of previous research using multiple measures of psychopathy, suggesting that variability along this dimension is a true and reliable contributor to individual differences in contagious yawning in the general population. While these findings are consistent with an indirect link between contagious yawning and empathy, they also align with functional accounts of spontaneous and contagious yawning and a generalized impairment in overall patterns of behavioral contagion among people high in psychopathic traits19. Given the mixed and inconsistent psychological literature on contagious yawning, we hope this research spurs further replication efforts within this area.

Methods

Participants

This study included two separate but simultaneous online recruitment methods occurring from September 2020 to May 2021. The first consisted of a university sample drawn from a psychology pool at a public research university in the United States, and the sample size (N = 93) was determined by the total recruitment from a single academic year. The second consisted of a more diverse sample including both university students recruited from a psychology research pool and biology courses in The Netherlands and participants from the community that were recruited through snowball sampling, and the sample size (N = 419) was determined by the total recruitment from a single academic term with a cap set at 425. Participants either received university course research credit or elected to complete the study on a voluntary basis.

Of the 512 total respondents to the online study, nine participants did not indicate that they were 18 years or older, and thus were removed from the analysis. In addition, 41 participants failed to complete the entire study after it was launched, and four participants disclosed that they did not watch any of the contagious yawning stimulus (see below). This left a total of 458 participants (329 female, 124 male, and 5 did not indicate their gender; age M ± SD: 20.42 ± 4.10) that were included in the analysis. Across this final sample, a total of 50 nationalities were represented (Fig. 1), though the majority came from the United States and the Netherlands (60.9% combined). The study was conducted in accordance with human ethics guidelines and approved by the Institutional Review Board at SUNY Polytechnic Institute (#IRB-2020-13) and the Psychology Research Ethics Committee at Leiden University (#2021-03-22-M.E. Kret-V2-3088), and all participants provided informed consent prior to partaking in this study.

Procedure

Participants were provided links to the study offered either through Google Forms or Qualtrics. Respondents first provided their age in years, gender (male, female, prefer not to say), nationality, number of hours slept the previous night, and how tired they were on an 11-point scale (0—not at all tired; 10—very tired). Next, participants were instructed to pay close attention to a 3 min 34 s contagious yawning stimulus derived from online sources (“Yawn-o-meter”). This stimulus presented a compilation of video clips depicting 50 yawns, which were labeled #1–50 on the top righthand portion of the screen, and included 49 yawns from humans and 1 yawn from a dog. The video clips averaged just over 4 s in length and were displayed consecutively without delay. All clips began with either the start of a yawn or mid-yawn prior to the peak muscular contraction94, and each clip ended with the conclusion of the yawning act. Only minimal pre- and post-yawn time was shown. The stimulus did not contain any audio, and participants were instructed to watch the entire video prior to moving forward. Given that prior work has shown that self-report is a valid measure of contagious yawning41,69,92, participants were then asked to indicate whether they yawned while watching the video (yes/no).

Participants then filled out five questions assessing their attention to the video while it was displayed. The first four questions were based on their memory of the specifics of the video content, and included (1) recalling how many yawns were presented, (2) remembering whether any non-human animals yawned during the video (yes/no), and (3–4) separately identifying whether two individuals, depicted by still image headshots, were in the video (the first person was from the video, while the second person was not). Based on the number of correct responses to these questions, a total objective attention score was derived (0–4). Lastly, a subjective measure of attention was included, where participants reported how much attention they paid to the video while it was playing on an 11-point scale (0–10; 0–100%). Those that responded with 0 (N = 4) were removed from the analysis.

Next, participants completed the following psychopathic trait instruments for community samples: the LSRPS, which included both primary and secondary measures of psychopathy79, the Dirty Dozen80, and the PPTS81. For the LSRPS, participants responded to how much they agreed to 26 statements on a 4-point scale (1—strongly disagree; 4 strongly agree). This instrument was designed to capture indices of both primary psychopathy (16 questions) and secondary psychopathy (10 questions), which was based on a model proposed by Karpman95,96. The primary psychopathy scale includes measures of callousness, manipulation, selfishness and deceit, while the secondary psychopathy scale measures antisocial behavior characterized by emotional disorder and impulsivity65. Strengths to this measure include the primary and secondary psychopathy distinction, which also differ in terms of affective-interpersonal (primary) and antisocial-behavioral (secondary) dimensions. Internal consistency was high for the primary scale (α = 0.808) and acceptable for the secondary scale (α = 0.671). For the Dirty Dozen, participants responded to how much they agreed to 12 statements on a 9-point scale (1—disagree strongly; 9 agree strongly). This instrument was assembled to represent a concise measure of the dark triad, including separate constructs (four questions each) for psychopathy, Machiavellianism, and narcissism. Thus, the brevity is both a strength and weakness to this measure, as it can be easily assessed but is limited in scope. For the purpose of this study, the internal consistency for psychopathy was assessed and found to be acceptable (α = 0.770). The PPTS consists of 20 statements, in which participants responded with either agree (1) or disagree (0). A strength to the PPTS is that it was designed to measure psychopathic personality traits regardless of respondents' cultural background or criminal history81. The PPTS was designed to measure four separate subscales of psychopathy, including affective responsiveness, cognitive responsiveness, interpersonal manipulation, and egocentricity. The internal consistency was acceptable for the combined measure (α = 0.710) and interpersonal manipulation subscale (α = 0.660), but low for affective responsiveness (α = 0.586), cognitive responsiveness (α = 0.533), and egocentricity (α = 0.398). Thus, only the combined PPTS score was included in the subsequent analyses. As a validation, all four measures of psychopathy were highly correlated with one another (ps < 0.001), with the secondary psychopathy scale from the LSRPS showing the weakest relationship to the others (supplemental material: Table S1).

Analysis

To assess the association between yawn contagion and psychopathic traits, we initially ran comparisons between contagious yawners and non-yawners across each psychopathy measure. Shapiro-Wilks normality tests were run for all variables, and due to the nonnormal distributions of our data (ps < 0.001), a nonparametric Mann–Whitney U test was applied. Then, binary logistic regressions (yawn: yes/no) were run separately for each psychopathy measure, taking into account participant gender, age, hours of sleep the previous night, current tiredness, and objective and subjective measures of attention. All analyses were conducted in Jamovi 2.0.1, and consisted of two-tailed tests with the alpha set to 0.05.

Ethics

The study was conducted in accordance with human ethics guidelines and approved by the Institutional Review Board at SUNY Polytechnic Institute (#IRB-2020-13) and the Psychology Research Ethics Committee at Leiden University (#2021-03-22-M.E. Kret-V2-3088), and all participants provided informed consent prior to partaking in this study.

Data availability

Data used in the analyses for this paper are available as supplemental material.

References

  1. Provine, R. R. Yawning as a stereotyped action pattern and releasing stimulus. Ethology 72, 109–122 (1986).

    Google Scholar 

  2. Platek, S. M., Critton, S. R., Myers, T. E. & Gallup, G. G. Jr. Contagious yawning: The role of self-awareness and mental state attribution. Cogn. Brain Res. 17, 223–227 (2003).

    Google Scholar 

  3. Anderson, J. R., Myowa-Yamakoshi, M. & Matsuzawa, T. Contagious yawning in chimpanzees. Proc. R. Soc. B. 271, S468–S470 (2004).

    PubMed  PubMed Central  Google Scholar 

  4. van Berlo, E., Díaz-Loyo, A. P., Juárez-Mora, O. E., Kret, M. E. & Massen, J. J. M. Experimental evidence for yawn contagion in orangutans (Pongo pygmaeus). Sci. Rep. 10, 1–11 (2020).

    Google Scholar 

  5. Joly-Mascheroni, R. M., Senju, A. & Shepherd, A. J. Dogs catch human yawns. Biol. Lett. 4, 446–448 (2008).

    PubMed  PubMed Central  Google Scholar 

  6. Norscia, I., Coco, E., Robino, C., Chierto, E. & Cordoni, G. Yawn contagion in domestic pigs (Sus scrofa). Sci. Rep. 11, 1–12 (2021).

    Google Scholar 

  7. Miller, M. L., Gallup, A. C., Vogel, A. R., Vicario, S. M. & Clark, A. B. Evidence for contagious behaviors in budgerigars (Melopsittacus undulatus): An observational study of yawning and stretching. Behav. Proc. 89, 264–270 (2012).

    Google Scholar 

  8. Gallup, A. C., Swartwood, L., Militello, J. & Sackett, S. Experimental evidence of contagious yawning in budgerigars (Melopsittacus undulatus). Anim. Cogn. 18, 1051–1058 (2015).

    PubMed  Google Scholar 

  9. De Vries, J. I., Visser, G. H. & Prechtl, H. F. The emergence of fetal behaviour I. Qualitative aspects. Early Hum. Dev. 7, 301–322 (1982).

    PubMed  Google Scholar 

  10. Massen, J. J. M. et al. Brain size and neuron numbers drive differences in yawn duration across mammals and birds. Commun. Biol. 4, 1–10 (2021).

    Google Scholar 

  11. Provine, R. R. Yawning: The yawn is primal, unstoppable and contagious, revealing the evolutionary and neural basis of empathy and unconscious behavior. Am. Sci. 93, 532–539 (2005).

    Google Scholar 

  12. Hoogenhout, M., van der Straaten, K., Pileggi, L. A. & Malcolm-Smith, S. Young children display contagious yawning when looking at the eyes. J. Child Adolesc. Behav. 1, 2 (2013).

    Google Scholar 

  13. Cordoni, G., Favilli, E. & Palagi, E. Earlier than previously thought: Yawn contagion in preschool children. Dev. Psychobiol. 63, 931–944 (2021).

    PubMed  Google Scholar 

  14. Gallup, A. C. Why do we yawn? Primitive versus derived features. Neurosci. Biobehav. Rev. 35, 765–769 (2011).

    PubMed  Google Scholar 

  15. Eldakar, O. T. et al. Temperature-dependent variation in self-reported contagious yawning. Adapt. Hum. Behav. Physiol. 1, 460–466 (2015).

    Google Scholar 

  16. Gallup, A. C., Church, A. M., Miller, H., Risko, E. F. & Kingstone, A. Social presence diminishes contagious yawning in the laboratory. Sci. Rep. 6, 1–5 (2016).

    Google Scholar 

  17. Gallup, A. C., Vasilyev, D., Anderson, N. & Kingstone, A. Contagious yawning in virtual reality is affected by actual, but not simulated, social presence. Sci. Rep. 9, 1–10 (2019).

    CAS  Google Scholar 

  18. Helt, M. S., Fein, D. A. & Vargas, J. E. Emotional contagion in children with autism spectrum disorder varies with stimulus familiarity and task instructions. Dev. Psychopathol. 32, 383–393 (2020).

    PubMed  Google Scholar 

  19. Helt, M. S., Sorensen, T. M., Scheub, R. J., Nakhle, M. B. & Luddy, A. C. Patterns of contagious yawning and itching differ amongst adults with autistic traits vs. psychopathic traits. Front. Psychol. 12, 645310 (2021).

    PubMed  PubMed Central  Google Scholar 

  20. Bartholomew, A. J. & Cirulli, E. T. Individual variation in contagious yawning susceptibility is highly stable and largely unexplained by empathy or other known factors. PLoS ONE 9, e91773 (2014).

    ADS  PubMed  PubMed Central  Google Scholar 

  21. Franzen, A., Mader, S. & Winter, F. Contagious yawning, empathy, and their relation to prosocial behavior. J. Exp. Psychol. Gen. 147, 1950 (2018).

    PubMed  Google Scholar 

  22. Palagi, E., Celeghin, A., Tamietto, M., Winkielman, P. & Norscia, I. The neuroethology of spontaneous mimicry and emotional contagion in human and non-human animals. Neurosci. Biobehav. Rev. 111, 149–165 (2020).

    PubMed  Google Scholar 

  23. Massen, J. J. M. & Gallup, A. C. Why contagious yawning does not (yet) equate to empathy. Neurosci. Biobehav. Rev. 80, 573–585 (2017).

    PubMed  Google Scholar 

  24. Lehmann, H. E. Yawning: A homeostatic reflex and its psychological significance. Bull. Menninger Clin. 43, 123 (1979).

    CAS  PubMed  Google Scholar 

  25. Preston, S. D. & de Waal, F. B. Empathy: Its ultimate and proximate bases. Behav. Brain Sci. 25, 1–20 (2002).

    PubMed  Google Scholar 

  26. Preston, S. D. & de Waal, F. B. Only the PAM explains the personalized nature of empathy. Nat. Rev. Neurosci. 18, 769–769 (2017).

    CAS  PubMed  Google Scholar 

  27. De Waal, F. B. & Preston, S. D. Mammalian empathy: Behavioural manifestations and neural basis. Nat. Rev. Neurosci. 18, 498–509 (2017).

    PubMed  Google Scholar 

  28. Adolphs, R. Perception and emotion. How we recognize facial expressions. Curr. Dir. Pyschol. Sci. 15, 222–226 (2006).

    Google Scholar 

  29. Hatfield, E., Cacioppo, J. T. & Rapson, R. L. Emotional contagion. Curr. Dir. Psychol. Sci. 2, 96–100 (1993).

    Google Scholar 

  30. van Boxtel, A., Zaalberg, R., & de Wied, M. Subnormal short‐latency facial mimicry responses to dynamic emotional facial expressions in male adolescents with disruptive behavior disorders and callous‐unemotional traits. Psychophysiology e13945 (2021).

  31. Thorpe, W. H. Learning and Instinct in Animals (Methuen, 1963).

    Google Scholar 

  32. Yoon, J. M. & Tennie, C. Contagious yawning: A reflection of empathy, mimicry, or contagion?. Anim. Behav. 79, e1–e3 (2010).

    Google Scholar 

  33. Zentall, T. R. Imitation in animals: evidence, function, and mechanisms. Cybern. Syst. 32, 53–96 (2001).

    MATH  Google Scholar 

  34. Chan, M. H. & Tseng, C. H. Yawning detection sensitivity and yawning contagion. i-Perception 8, 2041669517726797 (2017).

    PubMed  PubMed Central  Google Scholar 

  35. Gottfried, J., Lacinová, L. & Širůček, J. Contagious yawning and empathy. Exp. Psycholol. 9 (2015).

  36. Haker, H. & Rössler, W. Empathy in schizophrenia: Impaired resonance. Eur. Arch. Psychiatry Clin. Neurosci. 259, 352–361 (2009).

    PubMed  Google Scholar 

  37. Davis, M. H. Interpersonal reactivity index (IRI). A multidimensional approach to individual differences in empathy. JSAS Catal. Sel. Docum. Psychol. 10, 85 (1980).

  38. Norscia, I. & Palagi, E. Yawn contagion and empathy in Homo sapiens. PLoS ONE 6, e28472 (2011).

    ADS  CAS  PubMed  PubMed Central  Google Scholar 

  39. Norscia, I., Zanoli, A., Gamba, M. & Palagi, E. Auditory contagious yawning is highest between friends and family members: Support to the emotional bias hypothesis. Front. Psychol. 11, 442 (2020).

    PubMed  PubMed Central  Google Scholar 

  40. Gallup, A. C. On the link between emotional contagion and contagious yawning. Neurosci. Biobehav. Rev. 21, 18–19 (2021).

    Google Scholar 

  41. Massen, J. J. M., Church, A. M. & Gallup, A. C. Auditory contagious yawning in humans: An investigation into affiliation and status effects. Front. Psychol. 6, 1735 (2015).

    PubMed  PubMed Central  Google Scholar 

  42. Christov-Moore, L. et al. Empathy: Gender effects in brain and behavior. Neurosci. Biobehav. Rev. 46, 604–627 (2014).

    PubMed  PubMed Central  Google Scholar 

  43. Norscia, I., Demuru, E. & Palagi, E. She more than he: Gender bias supports the empathic nature of yawn contagion in Homo sapiens. Royal Soc. Open Sci. 3, 150459 (2016).

    ADS  Google Scholar 

  44. Gallup, A. C. & Massen, J. J. M. There is no difference in contagious yawning between men and women. R. Soc. Open Sci. 3, 160174 (2016).

    ADS  PubMed  PubMed Central  Google Scholar 

  45. Jones, A. P., Happé, F. G., Gilbert, F., Burnett, S. & Viding, E. Feeling, caring, knowing: Different types of empathy deficit in boys with psychopathic tendencies and autism spectrum disorder. J. Child Psychol. Psychiatry 51, 1188–1197 (2010).

    PubMed  PubMed Central  Google Scholar 

  46. Baron-Cohen, S. et al. Why are autism spectrum conditions more prevalent in males?. PLoS Biol. 9, e1001081 (2011).

    CAS  PubMed  PubMed Central  Google Scholar 

  47. Forth, A. E., Brown, S. L., Hart, S. D. & Hare, R. D. The assessment of psychopathy in male and female noncriminals: Reliability and validity. Pers. Indiv. Differ. 20, 531–543 (1996).

    Google Scholar 

  48. Gallup, A. C. & Gallup, G. G. Jr. Yawning as a brain cooling mechanism: nasal breathing and forehead cooling diminish the incidence of contagious yawning. Evol. Psychol. 5, 92–101 (2007).

    Google Scholar 

  49. Gallup, A. C. & Meyers, K. Seeing others yawn selectively enhances vigilance: An eye-tracking study of snake detection. Anim. Cogn. 24, 583–592 (2021).

    PubMed  Google Scholar 

  50. Massen, J. J. M., Vermunt, D. A. & Sterck, E. H. Male yawning is more contagious than female yawning among chimpanzees (Pan troglodytes). PLoS ONE 7, e40697 (2012).

    ADS  CAS  PubMed  PubMed Central  Google Scholar 

  51. Miller, M. L., Gallup, A. C., Vogel, A. R. & Clark, A. B. Handling stress initially inhibits, but then potentiates yawning in budgerigars (Melopsittacus undulatus). Anim. Behav. 80, 615–619 (2010).

    Google Scholar 

  52. Miller, M. L., Gallup, A. C., Vogel, A. R. & Clark, A. B. Auditory disturbances promote temporal clustering of yawning and stretching in small groups of budgerigars (Melopsittacus undulatus). J. Comp. Psychol. 126, 324 (2012).

    PubMed  Google Scholar 

  53. Casetta, G., Nolfo, A. P. & Palagi, E. Yawn contagion promotes motor synchrony in wild lions, Panthera leo. Anim. Behav. 174, 149–159 (2021).

    Google Scholar 

  54. Colombi, C. et al. Examining correlates of cooperation in autism: Iimitation, joint attention, and understanding intentions. Autism 13, 143–163 (2009).

    PubMed  Google Scholar 

  55. Hermans, E. J., van Wingen, G., Bos, P. A., Putman, P. & van Honk, J. Reduced spontaneous facial mimicry in women with autistic traits. Biol. Psychol. 80, 348–353 (2009).

    PubMed  Google Scholar 

  56. Yoshimura, S., Sato, W., Uono, S. & Toichi, M. Impaired overt facial mimicry in response to dynamic facial expressions in high-functioning autism spectrum disorders. J Autism Dev. Disord. 45, 1318–1328 (2015).

    PubMed  Google Scholar 

  57. Fitzpatrick, P. et al. Impairments of social motor synchrony evident in autism spectrum disorder. Front. Psychol. 7, 1323 (2016).

    PubMed  PubMed Central  Google Scholar 

  58. Rilling, J. K. et al. Neural correlates of social cooperation and non-cooperation as a function of psychopathy. Biol. Psychiatry 61, 1260–1271 (2007).

    PubMed  Google Scholar 

  59. de Wied, M., van Boxtel, A., Matthys, W. & Meeus, W. Verbal, facial and autonomic responses to empathy-eliciting film clips by disruptive male adolescents with high versus low callous-unemotional traits. J. Abnorm. Child Psychol. 40, 211–223 (2012).

    PubMed  Google Scholar 

  60. Baysinger, M. A., Scherer, K. T. & LeBreton, J. M. Exploring the disruptive effects of psychopathy and aggression on group processes and group effectiveness. J. Appl. Psychol. 99, 48 (2014).

    PubMed  Google Scholar 

  61. Viding, E. & McCrory, E. Towards understanding atypical social affiliation in psychopathy. Lancet Psychiatry 6, 437–444 (2019).

    PubMed  Google Scholar 

  62. Senju, A. et al. Absence of contagious yawning in children with autism spectrum disorder. Biol. Lett. 3, 706–708 (2007).

    PubMed  PubMed Central  Google Scholar 

  63. Giganti, F. & Ziello, M. Contagious and spontaneous yawning in autistic and typically developing children. Curr. Psychol. Lett. Behav. Brain Cogn. 25 (2009).

  64. Helt, M. S., Eigsti, I. M., Snyder, P. J. & Fein, D. A. Contagious yawning in autistic and typical development. Child Dev. 81, 1620–1631 (2010).

    PubMed  Google Scholar 

  65. Senju, A. et al. Brief report: Does eye contact induce contagious yawning in children with autism spectrum disorder?. J. Autism Dev. Disord. 39, 1598–1602 (2009).

    PubMed  Google Scholar 

  66. Usui, S., Senju, A., Kikuchi, Y., Akechi, H., Tojo, Y., Osanai, H. & Hasegawa, T. Presence of contagious yawning in children with autism spectrum disorder. Autism Res. Treat. (2013).

  67. Mariscal, M. G. et al. Blood oxytocin concentration positively predicts contagious yawning behavior in children with autism spectrum disorder. Autism Res. 12, 1156–1161 (2019).

    PubMed  PubMed Central  Google Scholar 

  68. Norscia, I., Agostini, L., Moroni, A., Caselli, M., Micheletti-Cremasco, M., Vardé, C. & Palagi, E. Yawning is more contagious in pregnant than nulliparous women. Hum. Nat. 1–25 (2021).

  69. Gallup, A. C. & Church, A. M. The effects of intranasal oxytocin on contagious yawning. Neurosci. Lett. 607, 13–16 (2015).

    CAS  PubMed  Google Scholar 

  70. Kis, A., Tóth, K., Kanizsár, O. & Topál, J. The effect of oxytocin on yawning by dogs (Canis familiaris) exposed to human yawns. Appl. Anim. Behav. Sci. 223, 104916 (2020).

    Google Scholar 

  71. Rundle, B. K., Vaughn, V. R. & Stanford, M. S. Contagious yawning and psychopathy. Pers. Indiv. Differ. 86, 33–37 (2015).

    Google Scholar 

  72. Lilienfeld, S.O. & Widows, M. R. Psychopathic personality inventory revised: Professional manual. Psychol. Assess. Resour. (Lutz, FL) (2005).

  73. Gallup, A. C. & Eldakar, O. T. Contagious yawning and seasonal climate variation. Front. Evol. Neurosci. 3, 3 (2011).

    PubMed  PubMed Central  Google Scholar 

  74. Giganti, F. & Zilli, I. The daily time course of contagious and spontaneous yawning among humans. J. Ethol. 29, 215–219 (2011).

    Google Scholar 

  75. Eldakar, O. T. et al. Acute physical stress modulates the temporal expression of self-reported contagious yawning in humans. Adapt. Hum. Behav. Physiol. 3, 156–170 (2017).

    Google Scholar 

  76. Gallup, A. C. & Engert, K. Chewing on gum alters the expression of contagious yawning. Hum. Ethol. 34, 93–103 (2019).

    Google Scholar 

  77. Massen, J. J. M., Dusch, K., Eldakar, O. T. & Gallup, A. C. A thermal window for yawning in humans: Yawning as a brain cooling mechanism. Physiol. Behav. 130, 145–148 (2014).

    CAS  PubMed  Google Scholar 

  78. Ramirez, V., Ryan, C. P., Eldakar, O. T. & Gallup, A. C. Manipulating neck temperature alters contagious yawning in humans. Physiol. Behav. 207, 86–89 (2019).

    CAS  PubMed  Google Scholar 

  79. Levenson, M. R., Kiehl, K. A. & Fitzpatrick, C. M. Assessing psychopathic attributes in a noninstitutionalized population. J. Pers. Soc. Psychol. 68, 151 (1995).

    CAS  PubMed  Google Scholar 

  80. Jonason, P. K. & Webster, G. D. The dirty dozen: A concise measure of the dark triad. Psychol. Assess. 22, 420 (2010).

    PubMed  Google Scholar 

  81. Boduszek, D., Debowska, A., Dhingra, K. & DeLisi, M. Introduction and validation of psychopathic personality traits scale (PPTS) in a large prison sample. J. Crim. Justice 46, 9–17 (2016).

    Google Scholar 

  82. Hare, R. D. Manual for the Hare Psychopathy Checklist–Revised. 2nd Edn. (Multi-Health Systems, 2003).

  83. Feldman, R. The neurobiology of human attachments. Trends Cogn. Sci. 21, 80–99 (2017).

    PubMed  Google Scholar 

  84. Baenninger, R. On yawning and its functions. Psychon. Bull. Rev. 4, 198–207 (1997).

    CAS  PubMed  Google Scholar 

  85. Gallup, A. C. & Gallup, G. G. Jr. Yawning and thermoregulation. Physiol. Behav. 95, 10–16 (2008).

    CAS  PubMed  Google Scholar 

  86. Gallup, A. C. & Eldakar, O. T. The thermoregulatory theory of yawning: what we know from over 5 years of research. Front. Neurosci. 6, 188 (2013).

    PubMed  PubMed Central  Google Scholar 

  87. Gallup, A. C. Ambient temperature modulates yawning. Temperature 3, 23–24 (2016).

    Google Scholar 

  88. Giganti, F., Zilli, I., Aboudan, S. & Salzarulo, P. Sleep, sleepiness and yawning. in The Mystery of Yawning in Physiology and Disease. Vol. 28. 42–46. (Karger Publishers, 2010).

  89. Brinkley, C. A., Schmitt, W. A., Smith, S. S. & Newman, J. P. Construct validation of a self-report psychopathy scale: Does Levenson’s self-report psychopathy scale measure the same constructs as Hare’s psychopathy checklist-revised?. Pers. Individ. 31, 1021–1038 (2001).

    Google Scholar 

  90. Navas, M. P., Maneiro, L., Cutrín, O., Gómez‐Fraguela, J. A., & Sobral, J. Contributions of the dark triad to moral disengagement among incarcerated and community adults. Legal Criminol. Psychol. (2021).

  91. Boduszek, D., Debowska, A., Sherretts, N. & Willmott, D. Psychopathic personality traits scale (PPTS): Construct validity of the instrument in a sample of US prisoners. Front. Psychol. 9, 1596 (2018).

    PubMed  PubMed Central  Google Scholar 

  92. Greco, M. & Baenninger, R. Self-report as a valid measure of yawning in the laboratory. Bull. Psychon. Soc. 27, 75–76 (1989).

    Google Scholar 

  93. Campbell, M. W., & de Waal, F. B. Methodological problems in the study of contagious yawning. in The Mystery of Yawning in Physiology and Disease. Vol. 28. 120–127. (Karger Publishers, 2010).

  94. Barbizet, J. Yawning. J. Neurol. Neurosurg. Psychiatry 21, 203 (1958).

    CAS  PubMed  PubMed Central  Google Scholar 

  95. Karpman, B. On the need of separating psychopathy into two distinct clinical types: The symptomatic and the idiopathic. J. Crim. Psychopathol. 3, 112–137 (1941).

    Google Scholar 

  96. Karpman, B. The myth of the psychopathic personality. Am. J. Psychiatry 104, 523–534 (1948).

    CAS  PubMed  Google Scholar 

Download references

Acknowledgements

This work was generously supported by the College of Arts and Sciences at SUNY Poly.

Author information

Authors and Affiliations

Authors

Contributions

A.C.G. and J.J.M.M. conceived of the study and developed the methodology. A.C.G., M.E.K., and J.J.M.M. took part in project administration. A.C.G., M.E.K., O.T.E., J.F., and J.J.M.M. took part in data curation. A.C.G. performed the formal analysis. A.C.G. and J.J.M.M. took part in the visualization of data. A.C.G., M.E.K., O.T.E., J.F., and J.J.M.M. participated in writing, editing, and reviewing the manuscript.

Corresponding authors

Correspondence to Andrew C. Gallup or Jorg J. M. Massen.

Ethics declarations

Competing interests

The authors declare no competing interests.

Additional information

Publisher's note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary Information

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Gallup, A.C., Kret, M.E., Eldakar, O.T. et al. People that score high on psychopathic traits are less likely to yawn contagiously. Sci Rep 11, 23779 (2021). https://doi.org/10.1038/s41598-021-03159-1

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1038/s41598-021-03159-1

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.

Search

Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing