The effect of single dot movement on reaction time

YAMAMURA, Kaiji; ASHIDA, Hiroshi · 2013 · Crossref

DOI: 10.4992/pacjpa.77.0_3ev-065

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Summary

This study investigates the "effect of single dot movement" on human reaction time, specifically examining how the speed of a moving visual stimulus influences the timing of motor responses. The research is motivated by prior findings (Watanabe, 2008) suggesting that observing biological motion can automatically modulate an observer's movement timing, a phenomenon known as behavioral speed contagion. The authors sought to determine whether this effect persists when the stimulus is reduced to a single moving dot, and whether the perceived source of the movement (human vs. computer) alters the magnitude of this effect. The researchers conducted two experiments involving healthy adult participants. In Experiment 1, 17 participants (11 male, 6 female) performed a reaction time task where they pressed a button upon detecting the appearance of a dot. The dot’s movement speed varied between 300 and 1200 pixels per second (px/s). Crucially, the movement was presented under two conditions: "computer control," where the dot moved automatically, and "human control," where the dot’s movement was driven by a participant’s finger motion. Experiment 2 involved 6 participants (3 male, 3 female) and employed a deception technique to test the role of belief. Participants were told that computer-controlled movements were actually human-controlled, and vice versa, to isolate the effect of perceived agency from the actual source of motion. The results demonstrated that reaction times were significantly influenced by the speed of the dot’s movement. In Experiment 1, reaction times increased as the dot’s speed increased from 300 to 1200 px/s, regardless of whether the movement was computer-controlled or human-controlled. However, a significant interaction emerged in the lower speed range (300–750 px/s), where reaction times were significantly shorter in the human-controlled condition compared to the computer-controlled condition. In the higher speed range (750–1200 px/s), no significant difference was found between the two conditions. Experiment 2 confirmed that this facilitation effect depended on the belief that the movement was human-generated rather than the actual source. When participants believed the movement was human-controlled, reaction times were shorter, even if the movement was actually computer-generated. These findings suggest that the "effect of single dot movement" on reaction time is mediated by the observer’s perception of biological motion. The facilitation of reaction times occurs when observers believe they are watching human-generated movement, particularly at slower speeds. This implies that the automatic modulation of movement timing is not merely a response to visual kinematics but is linked to the cognitive attribution of agency and life detection. The study highlights that the belief in observing another person’s action can enhance motor readiness, supporting the idea that biological motion perception involves complex social-cognitive processes beyond simple visual tracking.

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• Empirical Findings: behavioral performance data