Effects of co-representation and social facilitation on time perception in joint action

This experiment is based on 2 backgrounds (single person scenario vs. joint scenario) × 2 time interval (long interval vs. short interval). The experimental paradigm adopts a time dichotomy task, in which a fixation point of 1000 ms is first presented on the screen, and then an orange solid circle (with a duration of 400 ms to 1000 ms, a step length of 100 ms, a total of 7 levels) or a green solid circle (with a duration of 1000 ms to 1600 ms, a step length of 100 ms, a total of 7 levels) with different durations are randomly presented. Subjects need to determine the duration of a solid circle that is consistent with their own learning stage, and determine whether the duration of the stimulus is "short" or "long" based on the criteria formed during the learning stage. Solid circles that do not belong to their own tasks do not require a response. In the process of data analysis, the proportion of subjects who judged the test stimulus to be "long" at each test level was first counted. Next, a logistic function was used to fit the results of each subject (Treutwin&Strasburger, 1999). Through this fitting function, we can obtain the subjective equality point, minimum perceptible difference, and Weber's score for each subject. Among them, the subjective equality point is the duration corresponding to the 50% probability judgment of "long" in the fitting function, reflecting the subjective time tendency. The minimum perceptible difference is judged to be half the "long" time difference with a 75% probability and a 25% probability, reflecting the absolute sensitivity of time perception. The lower the score, the higher the perceptual sensitivity. Weber's score is the ratio of the minimum perceptible difference to the subjective equivalence point, reflecting the relative sensitivity of time perception (Vroomen&Keetels, 2010; Yao Zhuxi et al., 2015). The lower the score, the higher the sensitivity of time perception.