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Direction repulsion in motion transparency

Published online by Cambridge University Press:  02 June 2009

Eric Hiris  and
Randolph Blake
Eric Hiris
Affiliation:
Department of Psychology/Vision Research Center, Vanderbilt University, Nashville
Randolph Blake
Affiliation:
Department of Psychology/Vision Research Center, Vanderbilt University, Nashville
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Abstract

A series of experiments investigated perceived direction of motion and depth segregation in motion transparency displays consisting of two planes of dots moving in different directions. Direction and depth judgments were obtained from human observers viewing these "bi-directional" animation sequences with and without explicit stereoscopic depth information. We found that (1) misperception of motion direction ("direction repulsion") occurs when two spatially intermingled directions of motion are within 60 deg of each other; (2) direction repulsion is minimal at cardinal directions; (3) perception of two directions of motion always results in separate motion planes segregated in depth; and (4) stereoscopic depth information has no effect on the magnitude of direction repulsion, but it does disambiguate the depth relations between motion directions. These results are developed within the context of a two-stage model of motion transparency. On this model, motion directions are registered within units subject to inhibitory interactions that cause direction repulsion, with the outputs of these units pooled within units selective for direction and disparity.

Keywords

MotionStereopsisDirectionDepthMotion transparency

Information

Type
Research Articles
Information
Visual Neuroscience , Volume 13 , Issue 1 , January 1996 , pp. 187 - 197
Copyright
Copyright © Cambridge University Press 1996

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