Fig. 1 | Nature Communications

Fig. 1

From: Discrete and continuous mechanisms of temporal selection in rapid visual streams

Fig. 1

Experimental design and behavioral evidence for gradual temporal selection. a Schematic representation of parallel and serial model of temporal selection. From top to bottom are represented the stream of stimuli, the activity in sensory areas, the gradual selection hypothesis, and the discrete selection hypothesis. Each colored curve represents the predicted brain response for one stimulus in the RSVP at a certain stage of processing. In both models, stimuli are integrated in parallel at the sensory level. In the gradual selection model, attention selects multiple stimuli simultaneously. All stimuli benefit from attentional enhancement but at varying degrees. By contrast, in the discrete selection model, attention is all-or-none and only one stimulus is selected for further processing. b Schematic representation of the tasks. In the localizer task (upper part), one stimulus was presented and subjects had to indicate their category. During the dual-task (lower part), stimuli were presented in a rapid visual stream. Subjects were instructed to first determine the color of the very first stimulus (T1) and then identify the image surrounded by a green square (T2). Subjects made systematically three guesses for T2 by order of preference (i.e., from the most probably correct response to the least probably correct). For copyright reasons, the stimuli used in the experiment are replaced by representative images. c Distribution of subjects’ reports. Rows represent Guess 1, 2, and 3 and columns represent inter-target lags (blue, magenta, red and orange for Lag 1, 3, 7, and 9, respectively). For each position in the RSVP, the proportion of trials was compared to the chance level. A significant difference is indicated by an asterisk (*P < .05; **P < .01; ***P < .001). Error bars represent standard error to the mean. d Average ( ± standard error) mode and variance (e) of subjects’ report distributions as a function of inter-target lag. For Guess 2 and 3 panels, trials were split according to Guess 1 position. Closed symbols: subjects reported T-1 as Guess 1; Open symbols: subjects reported T + 1 as Guess 1. Asterisks represent results of a repeated-measures ANOVA with the inter-target lag as a within-subject factor: *P < .05; **P < .01; ***P < .001

Back to article page