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Journal of Neuroscience, Vol 14, 2178-2189, Copyright © 1994 by Society for Neuroscience
Neural correlates of attentive selection for color or luminance in extrastriate area V4
BC Motter
VA Medical Center, Syracuse, New York 13210.
Rhesus monkeys were trained on a conditional orientation discrimination
task in order to assess whether attentive selection for a color or
luminance stimulus feature would affect visual processing in extrastriate
area V4. The task required monkeys to select a bar stimulus based on its
color or luminance and then to discriminate the angular tilt of the
selected stimulus. The majority of neurons (74%) were selectively activated
when the color or luminance of the stimulus in the receptive field matched
the color or luminance of the cue. The activity was attenuated when there
was not a match between the stimulus and the cue. The differential
activation was based on the presence or absence of the stimulus feature and
was independent of spatial location. Across the population of V4 neurons,
optimal stimuli that matched the selected color or luminance elicited about
twice the activity as stimuli that did not match the selected feature. The
feature-selective changes in activity were observed to develop beginning
about 200 msec after the stimulus onset and were maintained over the
remainder of the behavioral trial. In this task the activity of V4 neurons
reflected a selection based on the cued feature and not simply the physical
color or luminance of the receptive field stimulus. Under these conditions,
the topographic representation of the neural activity in area V4 highlights
the potential targets in the visual scene at the expense of background
objects. These observations offer a physiological counterpart to
psychophysical studies suggesting that stimuli can be preferentially
selected in parallel across the visual field on the basis of a unique color
or luminance feature.
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