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The role of prefrontal cortex in the control of feature attention in area V4
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The role of prefrontal cortex in the control of feature attention in area V4
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Journal Article
The role of prefrontal cortex in the control of feature attention in area V4
2019
Overview
When searching for an object in a cluttered scene, we can use our memory of the target object features to guide our search, and the responses of neurons in multiple cortical visual areas are enhanced when their receptive field contains a stimulus sharing target object features. Here we tested the role of the ventral prearcuate region (VPA) of prefrontal cortex in the control of feature attention in cortical visual area V4. VPA was unilaterally inactivated in monkeys performing a free-viewing visual search for a target stimulus in an array of stimuli, impairing monkeys’ ability to find the target in the array in the affected hemifield, but leaving intact their ability to make saccades to targets presented alone. Simultaneous recordings in V4 revealed that the effects of feature attention on V4 responses were eliminated or greatly reduced while leaving the effects of spatial attention on responses intact. Altogether, the results suggest that feedback from VPA modulates processing in visual cortex during attention to object features.
The neural mechanisms underlying feature based attention to targets in a cluttered scene are not well understood. Here, the authors show that inactivation of the ventral prearcuate region leads to deficits in picking out a target among many stimuli as well as eliminates the feature based modulation of responses of V4 neurons.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 9/97
/ Animals
/ Behavior, Animal - physiology
/ Bias
/ Evoked Potentials, Visual - physiology
/ Feedback, Physiological - physiology
/ Humanities and Social Sciences
/ Male
/ Memory
/ Muscimol - administration & dosage
/ Photic Stimulation - methods
/ Prefrontal Cortex - drug effects
/ Prefrontal Cortex - physiology
/ Science
