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Postcoincidence trajectory duration affects motion event perception

Watanabe, Katsumi and Shimojo, Shinsuke (2001) Postcoincidence trajectory duration affects motion event perception. Perception and Psychophysics, 63 (1). pp. 16-28. ISSN 0031-5117. doi:10.3758/bf03200498.

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In a two-dimensional display, identical visual targets moving toward and across each other with equal, constant speed can be perceived either to reverse their motion directions at the coincidence point (bouncing percept) or to stream through one another (streaming percept). Although there is a strong tendency to perceive the streaming percept, various factors have been reported to induce the bouncing percept, such as a sound or a visual flash at the moment of the visual target coincidence. By changing duration of the postcoincidence trajectory (PCT), we investigated how long it would take for such bounce-inducing factors to be maximally effective after the visual coincidence. With bounceinducing factors, the percentage of the bouncing percept did not reach its maximal level immediately after the coincidence but increased as a function of PCT duration up to 150–200 msec. The results clearly reject the possibility of the cognitive-bias hypothesis about the bounce-inducing effect and suggest rather that the bounce-inducing factors have to interact with the PCT for some period after the coincidence to be maximally effective.

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Additional Information:© 2001 Psychonomic Society, Inc. Manuscript received March 11, 1999; revision accepted for publication March 24, 2000. This work was supported by the Sloan Foundation for Theoretical Neurobiology to K.W. The authors thank Sverker Runeson, Leo Poom, and anonymous reviewers for useful comments and suggestions for an earlier version of the manuscript and Johanna Weber for valuable comments and editing.
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:Visual Target; Visual Motion; Motion Perception; Coincidence Point; Sound Condition
Issue or Number:1
Record Number:CaltechAUTHORS:20200221-161653001
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Official Citation:Watanabe, K., Shimojo, S. Postcoincidence trajectory duration affects motion event perception. Perception & Psychophysics 63, 16–28 (2001).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101480
Deposited By: Tony Diaz
Deposited On:22 Feb 2020 19:22
Last Modified:16 Nov 2021 18:03

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