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J Neurophysiol (January 28, 2009). doi:10.1152/jn.00035.2009
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Submitted on January 12, 2009
Accepted on January 21, 2009

Neural basis of the set-size effect in frontal eye field: Timing of attention during visual search

Jeremiah Y. Cohen1, Richard P. Heitz, Geoffrey F. Woodman2, and Jeffrey D Schall1*

1 Vanderbilt University
2 Vanderbilt Univ.

* To whom correspondence should be addressed. E-mail: jeffrey.d.schall{at}vanderbilt.edu.

Visual search for a target object among distractors often takes longer when more distractors are present. To understand the neural basis of this capacity limitation, we recorded activity from visually-responsive neurons in the frontal eye field of macaque monkeys searching for a target among distractors defined by form (randomly oriented T or L). To test the hypothesis that the delay of response time with increasing number of distractors originates in the delay of attention allocation by frontal eye field neurons, we manipulated the number of distractors presented with the search target. When monkeys were presented with more distractors, visual target selection was delayed and neuronal activity was reduced in proportion to longer response time. These findings indicate that the time taken by frontal eye field eurons to select the target contributes to the variation in visual search efficiency.




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