Abstract
The timing intervals initiated by voluntary pressing actions are subjectively compressed compared with those initiated by voluntary releasing actions. Event-related potentials (ERPs) were employed in the present study to uncover the temporal mechanisms underlying this temporal illusion. The results revealed that the mean amplitude of the P1 component over the frontal-central recording sites, but not the P2 component, was larger in the voluntary pressing condition than in the voluntary releasing condition at the time perception stage. In the fronto-central region, increases in oscillatory activities of delta-theta frequency range (1-7 Hz) were found in the voluntary pressing condition, which corresponded with the emergence of the P1 peak. In addition, the P1 amplitude was negatively related to the corresponding reported time length at the single-trial level. These results are discussed in terms of the functional role of the response-locked P1 in the time perception stage.
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Introduction
Time interval estimation within a few hundred milliseconds is susceptible to different types of temporal illusions elicited by various factors (e.g., stimuli features, motion and emotion)1,2,3,4,5. One of these illusions is that the timing interval is experienced as shorter when it is induced by voluntary pressing compared with voluntary releasing actions6. In one of our previous studies, participants were asked to estimate the lengths of temporal intervals of which the start points were voluntary actions (pressing vs. releasing) and the endpoints were subsequent consequences. The reported intervals were shorter in the voluntary pressing condition than in both the voluntary releasing condition and the control condition when the timing intervals ranged from 250 to 1050 milliseconds6. This difference in the sense of time between two conditions is surprising and further investigation of this discrepancy may improve our understanding of subjective time perception and temporal judgments.
There has been ample evidence for the attentional allocation/distraction hypothesis, which states that attention plays a crucial role in the experience of temporal illusions7,8,9,10,11. This hypothesis assumes that when fewer attentional resources are allocated to a time estimation task (e.g., when participants are distracted by an irrelevant task), fewer pulses are counted by the interoceptive “interval clock”, leading to an overall underestimation of time duration8,11,12,13,14,15,16,17. In contrast, if participants are not distracted, more attentional capacity is available for temporal information processing and the perceived time duration increases18,19. This hypothesis is supported by previous studies using dual-task paradigms, in which one task is a time-relevant task (e.g., time estimation) and the other task is not (e.g., color judgment). The results indicated that subjective time was shorter when more attentional resources were allocated to the time-irrelevant task15,16. This modulating effect on time perception could also be reflected in the voltage changes of ERPs components. For instance, two recent works revealed that when attention was distracted by a pitch discrimination task, underestimation of time was reflected in the behavioral results and smaller contingent negative variation (CNV) amplitudes were found at fronto-central regions during the time perception stage20,21.
As for the compressed interval related to the pressing condition compared to the releasing condition, the attentional allocation/distraction hypothesis might provide a reasonable explanation. To examine whether attention is distracted in the time perception stage, the ERPs were employed in the present study because their fine-grained temporal resolution enables the separation of neural signals in response to different events that occur very close in time. However, unlike the stimulus-locked ERPs (including the CNV mentioned above), the stage of time perception for both voluntary pressing and releasing conditions is response-locked and ERP waveforms at this stage are unique. Among the major response-locked ERP components, the P1 and P2 most often appear in the interval between voluntary pressing action and subsequent outcome in response-locked ERP waveforms. In the experimental paradigms of motor movements, the P1 component ranged approximately 100 ms at the medial frontal cortex is correlated with corrected voluntary pressing action22,23,24. This fronto-central distributed P1 might reflect an expectancy of a predicted action consequence. If there is a mismatch between the predicted action consequence and the sensory feedback, the P1 disappears. Instead, an erroneous response elicits an opposite polarity component with the same latency and scalp distribution, which is referred to as the error related negativity (ERN)25,26. Similar to the P1 component, the P2 component might reflect the expectancy of a subsequent outcome at the same scalp distribution. This component is influenced by the contingency between a response and a subsequent consequence27. Higher outcome probabilities result in larger amplitudes of P228,29.
According to the classic attention allocation/distraction hypothesis, the amount of attentional resources that are distracted from a time perception task might be reflected in the variation of fronto-central distribution of P1 and P2 components underlying the comparison of time perception stage between voluntary pressing and releasing conditions. To ensure the reliability of our results, we used two timing intervals between actions and delayed feedbacks (240–280 ms and 440–480 ms). To eliminate possible confounds (such as force intensity) between the two voluntary actions a voluntary pressing/releasing lever (VPRL for short, see Figure 1) was designed and applied. We hypothesized that the reported interval would be shorter in the voluntary pressing condition than in the voluntary releasing condition across the two timing intervals. In addition, the evoked amplitudes of P1 and P2 were expected to be different between the two experimental conditions. Meanwhile, as the information regarding oscillatory dynamics from the EEG signal is largely lost by the time-locked averaging of single trials in the traditional ERPs approach30,31, this study also explored the dynamic oscillatory patterns in the EEG signal to uncover the differences between voluntary pressing and releasing conditions.
Results
Behavioral results
The main effect of “voluntary action” on reported time was significant, F(1, 15) = 53.66, p < 0.001, . The perceived interval in the voluntary pressing condition (M = 257.57 ms, SE = 12.11 ms) was shorter than in the voluntary releasing condition (M = 306.25 ms, SE = 11.92 ms). The main effect of “timing interval” was also significant, F(1, 15) = 16.91, p = 0.001, . The interaction between “voluntary action” and “timing interval” was not significant, F(1, 15) < 0.001, p = 0.99, .
ERP Results
The P1 component
For the mean amplitude of P1, the main effect of “voluntary action” was significant, F(1, 15) = 25.52, p < 0.001, . The P1 amplitude was significantly larger in the voluntary pressing condition (M = 1.57 μV, SE = 0.43 μV) than in the voluntary releasing condition (M = −0.63 μV, SE = 0.37 μV). Neither the main effect of “timing interval” (F(1, 15) = 0.21, p = 0.66, ) nor the interaction between two factors (F(1, 15) = 0.11, p = 0.75, ) was significant (see Figure 2).
The P2 component
For the mean amplitude of P2, there was no significant main effect of “voluntary action” (F(1, 15) = 0.009, p = 0.93, ) or “timing interval” (F(1, 15) = 0.41, p = 0.53, ) and their interaction was also not significant (F(1, 15) = 0.12, p = 0.73, ).
Time Frequency Results
For the baseline-corrected power at delta-theta frequencies (1–7 Hz) from 80 to 200 ms, the main effect of “voluntary action” was significant, F(1, 15) = 8.81, p = 0.01, . Compared to the voluntary releasing condition (M = 2.60 μV, SE = 0.25 μV), a significant increase in delta-theta power was observed in the voluntary pressing condition (M = 3.16 μV, SE = 0.36 μV). Neither the main effect of “timing interval” (F(1, 15) = 0.23, p = 0.64, ) nor the interaction between the two factors (F(1, 15) = 0.43, p = 0.52, ) was significant (see Figure 3).
For the baseline-corrected phase-locking value (PLV) at delta-theta frequencies (1–7 Hz), the main effect of “region of interest” was significant, F(1, 15) = 4.46, p = 0.05, . The interaction between the “region of interest” and “voluntary action” was also significant, F(1, 15) = 28.82, p < 0.001, . Post hoc pairwise comparisons indicated that the PLV was smaller in the voluntary pressing condition than in the voluntary releasing condition at the Fz electrode, t(15) = −2.17, p = 0.04. However, the PLV was marginally larger in the voluntary pressing condition than in the voluntary releasing condition at the C4 electrode, t(15) = 1.94, p = 0.07. There was no significant main effect of “voluntary action” (F(1, 15) = 0.002, p = 0.97, ) or “timing interval” (F(1, 15) = 0.18, p = 0.68, ) and their interaction was also not significant (F(1, 15) = 0.18, p = 0.67, ). The interaction between “timing interval” and “region of interest” was also not significant (F(1, 15) = 0.90, p = 0.36, ; see Figure 4).
Single-trial analysis of the relationship between P1 amplitude and reported interval
We adopted linear mixed models (LMM) to further explore the relationship between the behavioral variables of estimation of time interval and P1 amplitude at the single-trial level (Figure 5). The P1 amplitude was negatively related to the reported interval (such effect was maximal at FCz, from 45 to 103 milliseconds; t-value = −3.24, p = 0.005). This observation indicated that, at a within-individual level, trials with a larger P1 amplitude normally had a shorter reported time interval.
Discussion
In the present study, the ERP measurements, including the P1 and P2 components, were employed to compare different temporal courses between voluntary pressing and releasing conditions in the stages of time perception. Participants were asked to directly estimate the same timing intervals under two conditions (voluntary pressing vs. voluntary releasing) when the timing interval was set to 240–280 ms or 440–480 ms. The reported time was consistently compressed in the voluntary pressing condition compared to the voluntary releasing condition.
Regarding the ERP results for the time perception stage, a larger P1 was found in the voluntary pressing condition than in the voluntary releasing condition regardless of the length of the timing interval. These differences were maximal at the fronto-central region. In addition, the subjective time and P1 amplitude were significantly related at the single-trial level, i.e., the higher the amplitude of P1 the shorter the estimated interval. According to attentional allocation/distraction hypothesis, this P1 component, which captured a fronto-central distribution similar to the CNV in stimulus-locked ERP studies, might be an index of attentional allocation in the time perception stage. In previous studies, the P1 was observed following corrected pressing actions22,23,24. However, to our knowledge, no study has ever used the releasing action to investigate P1 amplitudes. The enhancement of P1 in the voluntary pressing condition might reflect that the attention to time events was diverted, thus resulting in underestimation of the timing interval. One might argue that this P1 component represents motor activity per se, such that the P1 finding in this study merely reflects different forms of motor activity in two conditions. We disagree with this viewpoint for the following reasons. First, during the experiment, participants were instructed to press or release the left CTRL key with their left fore-fingers. Presumably, the motor activity generated by the movement of this finger should be asymmetrically distributed, i.e., showing a brain response maximally distributed at the hemisphere contralateral to the moved hand/finger (e.g., primary motor cortex, around C4 electrode in the present study). In contrast, the detected P1 wave, as well as the difference of P1 between two conditions (pressing vs. releasing), was maximally distributed at the fronto-central region, which deviated from the motor-related brain regions.
Second, as revealed by the PLV results, the difference in PLV between the voluntary left pressing condition and the voluntary left releasing condition at the delta-theta band (1–7 Hz) was maximal at the contralateral-central region (i.e., maximal around C4 electrode). The scalp distribution of the PLV difference matched well with the configuration of the motor activity, indicating that the movement of the participants' left fore-fingers elicited changes in brain responses. These changes were captured in the phase space (indexed by delta-theta PLV) rather than in the power space (indexed by P1 amplitude and delta-theta power). The mismatch between the scalp distribution of P1 (and delta-theta power; maximal at fronto-central region) and delta-theta PLV (maximal at contralateral-central region) indicated that P1 and delta-theta power were minimally involved in the motor processing.
Finally, the appearance of the P1 corresponded with increased delta-theta power, which contrasts with previous findings that motor activity is associated with beta band rhythm32,33,34,35. Furthermore, the focal spatial and spectral distribution of the delta-theta responses with a maximum at fronto-central electrodes argues against the possibility that the responses were due to muscle activity.
What is the reason for the difference in attentional allocations between voluntary pressing and voluntary releasing conditions? One possible explanation involves differences between the after-action effects of the two actions. According to the internal models of motor control36,37,38, an efferent copy of a motor command enables the neural system to generate the expectancy of the predicted consequences of one's action before the actual feedback (see Figure 6). In our paradigm, the sensory feedback of the current action is delayed (see the Methods section) while the expectancy of predicted consequences from the efferent copy remains. Most importantly, the degree of expectancy between voluntary pressing and releasing is different. In daily life, the action of pressing is practiced more frequently and is often associated with timely feedback6. Thus, the prediction of feedback and the actual sensory feedback are frequently compared to optimize future predictions. In contrast, the action of releasing is seldom practiced and is not always accompanied by immediate consequences, as is the action of pressing. That is to say, the prediction is less optimized through this comparison. Hence, the expectancy of predicted consequences for the voluntary pressing action is influenced more strongly by previous experiences39,40 than is the voluntary releasing action. This enhanced expectancy may distract attention away from the temporal events in the stage of time perception, which leads to an underestimation of temporal intervals14,15. In short, a higher degree of expectancy is diverted to a break in the voluntary pressing condition, resulting in less attentional resources being allocated to time estimation and the perception of a shorter interval.
This speculation was also supported by spectral results, as the delta-theta power in the pressing cognition was enhanced compared to the releasing condition across the two timing intervals. These results seem to be responsible for the differences in amplitude in medial frontal region activities between voluntary pressing and releasing conditions. Specifically, the delta-theta frequency band has been found to be correlated with somatosensory expectations41. Meanwhile, theta and delta power enhancements have been associated with anticipation of upcoming events42,43. Thus the oscillation data support the viewpoint that increasing the expectancy of the predicted action consequence distracts more attention and results in shorter estimation of the time interval.
In addition, a P2 with fronto-central distribution was elicited for both conditions in the time perception stage. The amplitude showed no difference between voluntary pressing and releasing conditions regardless of the length of the time interval, which ranged from 240 to 280 ms or from 440 to 480 ms. Given that the contingency between the action and subsequent consequence was similar for the two conditions in this study, it is not surprising that no difference was found in this component. This result echoed a recent study in which tones coinciding with pressing or releasing actions elicited similar patterns of EEG waveforms44. Thus, we suggest that the different senses of time between voluntary pressing and releasing were not induced by the contingency between action and delayed outcome.
In summary, the behavioral results replicated findings suggesting that voluntary pressing and voluntary releasing actions correspond to different senses of elapsed time6, which is echoed by the compression effect associated with voluntary pressing actions5,45,46,47,48,49,50,51,52,53. Through the ERP technique, we found a difference in P1 between voluntary pressing and voluntary releasing conditions in the time perception stage. In addition, delta-theta band activity was consistently enhanced in the pressing condition across the two time intervals. These results suggested that the larger P1 with fronto-central distribution in the pressing condition might reflect that more attention was distracted from time perception, which resulted in shorter perceived interval between the pressing action and its following consequence.
Methods
Ethics Statement
The experiment was conducted in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of the Institute of Psychology, Chinese Academy of Sciences. All participants gave written informed consent prior to the experiment and were paid for their participation.
Participants
Sixteen right-handed, healthy volunteers (6 females; mean age: 22.69 ± 2.02 years) participated in the experiment. All had normal or corrected-to-normal vision and had not previously participated in any experiment related to time estimation.
Experimental tasks and procedure
A 17-inch cathode-ray tube (CRT) monitor running at a refresh rate of 85 Hz with a resolution of 1024 × 768 pixels as well as the software package E-prime 2.0 (Psychology Software Tools, Inc.), were used for stimuli presentation and behavioral data collection in our experiment. All participants were seated in a sound attenuated room, approximately 70 cm from the presentation screen. The experiment consisted of two conditions, voluntary pressing and voluntary releasing (see Figure 1).
Voluntary Pressing Condition
Upon presentation of a black square (stimulus 1, “S1” for short; size: 1 cm × 1 cm) at the center of the screen, participants were asked to relax and insert their left fore-finger into a metallic ring on the VPRL (see Figure 1). Participants were asked to press the left CTRL key whenever they intended to make a response. To prevent unconscious or accidental pressing and possible mistakes, we set an initial period of 500 ms during which pressing of the left CTRL key would incur a warning that asked participants to restart the current trial. When the left CTRL key was pressed after the warning period, the black square would disappear simultaneously with the response, followed by a blank screen that lasted for a random interval (240–280 ms or 440–480 ms). Thereafter, a red square (stimulus 2, “S2”; size: 1 cm × 1 cm) appeared at the center of the screen for 500 ms. Participants were then asked to estimate the interval between the time points at which the black square disappeared and the red square appeared by using the mouse to click on a continuous time scale (ranging from 0 to 600 ms with 5 markers each represented 100 ms divisions). Participants were asked to click anywhere on the scale to give a precise answer. The time scale remained visible until the response was made. Afterwards, an inter-trial interval that ranged randomly from 1800 ms to 2400 ms was presented (Figure 1B).
Voluntary Releasing Condition
Participants were asked to relax and insert their left fore-finger into a metallic loop on the VPRL. A blank screen was presented indefinitely until the participants pressed and held down the left CTRL key which elicited the presentation of S1 (size: 1 cm × 1 cm) at the center of the screen. Participants were asked to release the left CTRL key whenever they intended to make a response. Once the left CTRL key by voluntarily lifting the finger or wrist after at least 500 ms was released (similar to that of the pressing condition), the black square disappeared immediately. The rest of the procedure was similar to that of the voluntary pressing condition after the blank screen was presented.
In this study, the combination of two types of timing intervals (240–280 ms, 440–480 ms) and 2 two types of voluntary actions (voluntary pressing, voluntary releasing) resulted in four individual blocks in total. Each block consisted of 50 trials (200 trials in total). The sequence of the four blocks was counterbalanced across the participants.
Prior to the formal experiment, participants were given time to become familiar with the VPRL and experiment procedure. They were required to watch 12 examples of different timing intervals ranging from 100 to 600 ms to practice estimating time intervals. Participants who reported being unfamiliar with different types of time intervals were instructed to repeat this practice. Participants practiced four trials of each condition to familiarize themselves with the apparatus, procedure and tasks. In the formal task, we calculated ERPs aligned with the disappearance of the S1 (the black square) to test the temporal course of different conditions.
As for the behavioral results, the reported time was compared using a two-way repeated-measures analysis of variance (ANOVA), with “voluntary action”(two levels: pressing vs. releasing) and “timing interval” (two levels: 240–280 ms vs. 440–480 ms) as within-subject factors. All statistical analysis was performed using SPSS (17.0; SPSS, Inc., Chicago, IL).
EEG recordings and data analysis
EEG data were acquired using a 32-channel NuAmps Quickcap, 40-channel NuAmps DC amplifier and Scan 4.5 Acquisition Software (Compumedics Neuroscan, Inc.). EEG data were collected from 32 scalp electrodes (Fp1, Fp2, F7, F8, F3, F4, FT7, FT8, T3,T4, FC3, FC4, C3, C4, CP3, CP4, TP7, TP8, T5, T6, P3, P4, O1, O2, Fz, FCz, Cz, CPz, Pz, Oz, A1, A2) according to the international 10–20 system. The sampling rate was 1000 Hz. Horizontal electrooculograms (HEOGs) were recorded from electrodes placed at the outer canthi of both eyes. Vertical electrooculograms (VEOGs) were recorded from electrodes placed above and below the left eye. All EEG data that were right mastoid referenced on-line were re-referenced off-line to the averaged mastoid reference by subtracting one half of the activity recorded at the right mastoid from each sample of the data of each channel.
During the off-line analysis, ocular artifacts were removed using independent component analysis (ICA) decomposition implemented in the EEGLABtoolbox54, an open source toolbox running in the MATLAB environment. Continuous EEG data were band-pass filtered between 1 and 30 Hz. EEG epochs were extracted using a window of 800 ms (200 ms before the disappearance of S1 and 600 ms after the disappearance of S1) and baseline was corrected using the pre-stimulus interval (−200 to −100 ms).
Because both P1 and P2 were observed to be maximal at medial frontal cortex, their amplitudes were obtained by calculating the mean amplitudes within their respective time intervals (P1: 70–110 ms; P2: 160–200 ms) at the FCz electrode. The amplitudes of P1 and P2 were compared using a two-way repeated-measures analysis of variance (ANOVA) with “voluntary action” (two levels: pressing vs. releasing) and “timing interval” (two levels: 240–280 ms vs. 440–480 ms) as factors.
Time-frequency distributions (TFDs: both power and phase-locking value (PLV)) of the EEG time course were obtained using a windowed Fourier transform (WFT) with a fixed 250 ms Hanningwindow55. These parameters allow achieving a good tradeoff between time resolution and frequency resolution within the explored range of frequencies56. TFDs were then baseline-corrected (reference interval: −200 to −100 ms) at each explored frequency using subtraction approach57, which has been verified as an unbiased baseline correction strategy55,57. For each subject and each experimental condition, we extracted the baseline-corrected power at delta-theta frequencies (1–7 Hz) from 80 to 200 ms. Similar with ERPs, the obtained powers were compared using a two-way repeated-measures ANOVA, with “voluntary action” (two levels: pressing vs. releasing) and “timing interval” (two levels: 240–280 ms vs. 440–480 ms) as factors.
As for the PLV (phase-locking value), we conducted a three-way repeated-measures ANOVA, with “voluntary action” (two levels: pressing vs. releasing), “region of interest” (two electrodes: Fz vs C4) and “timing interval” (two levels: 240–280 ms vs. 440–480 ms) as factors. We extracted the baseline-corrected PLV at delta-theta frequencies (1–7 Hz) for Fz (170–220 ms) and C4 (80–200 ms), respectively. When an interaction was significant, post hoc pairwise comparisons was performed.
For each electrode and each time bin of the P1 waveform, the relationship between P1 amplitude and reported interval was assessed using linear mixed models. This procedure yielded time-courses of T-value, representing the strength of the relationship between P1 signal amplitude and reported intervals. To address the problem of multiple comparisons, the significance level (P-value) was corrected using a false discovery rate procedure58,59.
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Acknowledgements
This work was supported in part by grants from 973 Program (2011CB302201) and the National Natural Science Foundation of China (61075042).The authors sincerely thank Dr. Wen-jing Yan's help in the early stages of preparing the manuscript.
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K.Z. and X.L.F. had the idea and design the experiments; K.Z. and Y.C. prepared the experimental setup; K.Z., J.L. and Y.C. collected the data; K.Z., J.L., L.H. and P.X. analyzed all the data; K.Z., X.L.F., L.H., R.L.G., L.W. and J.L. wrote the paper.
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Zhao, K., Gu, R., Wang, L. et al. Voluntary Pressing and Releasing Actions Induce Different Senses of Time: Evidence from Event-Related Brain Responses. Sci Rep 4, 6047 (2014). https://doi.org/10.1038/srep06047
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DOI: https://doi.org/10.1038/srep06047
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