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Temporal dynamics of 2D and 3D shape representation in macaque visual area V4

Published online by Cambridge University Press:  04 October 2006

JAY HEGDÉ  and
DAVID C. VAN ESSEN
JAY HEGDÉ
Affiliation:
Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri Current address of Jay Hegdé: Department of Psychology, University of Minnesota, Minneapolis, MN 55455
DAVID C. VAN ESSEN
Affiliation:
Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri
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Abstract

We studied the temporal dynamics of shape representation in area V4 of the alert macaque monkey. Analyses were based on two large stimulus sets, one equivalent to the 2D shape stimuli used in a previous study of V2, and the other a set of stereoscopic 3D shape stimuli. As in V2, we found that information conveyed by individual V4 neurons about the stimuli tended to be maximal during the initial transient response and generally lower, albeit statistically significant, afterwards. The population response was substantially correlated from one stimulus to the next during the transients, and decorrelated as responses decayed. V4 responses showed significantly longer latencies than in V2, especially for the 3D stimulus set. Recordings from area V1 in a single animal revealed temporal dynamic patterns in response to the 2D shape stimuli that were largely similar to those in V2 and V4. Together with earlier results, these findings provide evidence for a distributed process of coarse-to-fine representation of shape stimuli in the visual cortex.

Keywords

DecorrelationDimensionality reductionMetric multidimensional scalingOnset transientsRate codingSignal-to-noise ratio.
Type
Research Article
Information
Visual Neuroscience , Volume 23 , Issue 5 , September 2006 , pp. 749 - 763
Copyright
2006 Cambridge University Press

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