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Journal of Neuroscience, Vol 14, 2190-2199, Copyright © 1994 by Society for Neuroscience
Neural correlates of feature selective memory and pop-out in extrastriate area V4
BC Motter
VA Medical Center, Syracuse, New York 13210.
Neural activity in area V4 was examined to assess (1) whether the effects
of attentive selection for stimulus features could be based on the memory
of the feature, (2) whether dynamically changing the feature selection
would cause activity associated with the newly selected stimuli to pop out,
and (3) whether intrusion of more than one stimulus into the receptive
field would disrupt the feature-selective activity. Rhesus monkeys were
trained on several variations of a conditional orientation discrimination
task. A differential activation of area V4 neurons was observed in the
conditional discrimination task based on the presence of a match or a
nonmatch between the conditional cue (a particular color or luminance) and
the color or luminance of the receptive field stimulus. The differential
activation was unchanged when the cue was removed and the animal had to
remember its color (or luminance) to perform the task. When the cued
feature was switched from one alternative to another in the middle of a
trial the differential activation of neurons reversed over the course of
150-300 msec. If the stimulus in the receptive field contained the newly
selected feature, V4 neurons became activated without a concomitant change
in the stimulus in classical receptive field. Across the topographic map of
V4 the activity associated with the newly selected stimuli popped out,
whereas the activity of deselected stimuli faded to the background levels
of other background objects. Evidence of a suppressive input from stimuli
outside the classical receptive field was clear in only 3 of 24 neurons
examined. Intrusion into the classical receptive field by a second stimulus
resulted in a diminished difference between matching and nonmatching
conditions. These physiological data suggest a major role for attentional
control in the parallel processing of simple feature-selective differences.
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