Dependency of the flash-lag effect on the active control of the stimulus(Various phenomena of visual motion and their underlying mechanisms,Symposiun 1 at the 26th Annual Meeting)

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  • ICHIKAWA Makoto
    Department of Psychology, Division of Behavioral Science, Chiba University

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  • 能動的観察と運動視 : フラッシュラグ効果を用いた検討(運動視の諸現象とメカニズム,第26回大会 シンポジウム1)
  • 能動的観察と運動視--フラッシュラグ効果を用いた検討
  • ノウドウテキ カンサツ ト ウンドウシ フラッシュ ラグ コウカ オ モチイタ ケントウ

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Abstract

We examined how observers' active control of the stimulus change affects the visual processing of motion. We compared the flash-lag effects for motion (Experiment 1) and for luminance (Experiment 2) under several conditions that differed in the degree of the observers' active control of change in a stimulus. The flash-lag effect was salient if the observers passively viewed the automatic change in the stimulus. However, if the observers actively controlled the stimulus change by the use of a computer-mouse, the flash-lag effect was significantly reduced. In Experiment 3, we examined how observers' active control of the stimulus movement by a mouse affects the reaction time for the shape change in the moving stimulus and flash. Results showed that the active control reduced the reaction time for both moving stimulus and flash. In Experiment 4, we found a significant reduction of the flash-lag effect was restricted to the condition in which the direction of the stimulus motion was consistent with the direction of the active mouse movement. These results suggest that the learning of a specific directional relationship between hand movements and stimulus movements is essential for the reduction of the flash-lag effect in terms of active observation.

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