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J Neurophysiol (January 28, 2004). doi:10.1152/jn.00780.2003
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Submitted on August 11, 2003
Accepted on January 21, 2004

Effects of Search Efficiency on Surround Suppression during Visual Selection in Frontal Eye Field

Jeffrey D. Schall*, Takashi R. Sato, Kirk G. Thompson, Amanda A. Vaughn, and Chi-Hung Juan

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

Previous research has shown that visually responsive neurons in the frontal eye field of macaque monkeys select the target for a saccade during efficient, pop-out visual search through suppression of the representation of the non-target distractors. For a fraction of these neurons the magnitude of this distractor suppression varied with the proximity of the target to the receptive field, exhibiting more suppression of the distractor representation when the target was nearby than when the target was distant. The purpose of this investigation was to determine whether the variation of distractor suppression related to target proximity varied with target-distractor feature similarity. The effect of target proximity on distractor suppression did not vary with target-distractor similarity and so may be an endogenous property of the selection process.




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