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Responses to direction and transparent motion stimuli in area FST of the macaque

Published online by Cambridge University Press:  28 April 2008

ARI ROSENBERG ,
PASCAL WALLISCH  and
DAVID C. BRADLEY
ARI ROSENBERG*
Affiliation:
Committee on Computational Neuroscience, University of Chicago, Chicago, Illinois
PASCAL WALLISCH
Affiliation:
Department of Psychology, University of Chicago, Chicago, Illinois
DAVID C. BRADLEY
Affiliation:
Committee on Computational Neuroscience, University of Chicago, Chicago, Illinois Department of Psychology, University of Chicago, Chicago, Illinois
*
Address correspondence and reprint requests to: Ari Rosenberg, 947 East 58th St., MC0926, Committee on Computational Neuroscience, University of Chicago, Chicago, IL, 60637. E-mail: arirose@uchicago.edu
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Abstract

Motion transparency occurs when multiple object velocities are present within a local region of retinotopic space. Transparent signals can carry information useful in the segmentation of moving objects and in the extraction of three-dimensional structure from relative motion cues. However, the physiological substrate underlying the detection of motion transparency is poorly understood. Direction tuned neurons in area MT are suppressed by transparent stimuli, suggesting that other motion sensitive areas may be needed to represent this signal robustly. Recent neuroimaging evidence implicated two such areas in the macaque superior temporal sulcus. We studied one of these, FST, with electrophysiological methods and found that a large fraction of the neurons responded well to two opposite directions of motion and to transparent stimuli containing those same directions. A linear combination of MT-like responses qualitatively reproduces this behavior and predicts that FST neurons can be tuned for transparent motion containing specific direction and depth components. We suggest that FST plays a role in motion segmentation based on transparent signals.

Keywords

FSTMTTransparent motionMotion opponencyMotion segmentation
Type
Research Article
Information
Visual Neuroscience , Volume 25 , Issue 2 , March 2008 , pp. 187 - 195
Copyright
Copyright © Cambridge University Press 2008

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