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AbstractTo dissociate the focus of attention from the endpoint of a saccade, macaque monkeys were trained to perform visual search for a uniquely colored rectangle and shift gaze either toward or opposite this color singleton according to its orientation (vertical cued prosaccade; horizontal, antisaccade). During antisaccade trials most neurons in the frontal eye fields (FEF) initially select the singleton but then modulate to select the saccade endpoint (Sato & Schall, 2003 Neuron). Saccade preparation was probed by measuring the direction of saccades evoked by FEF intracortical microstimulation at variable times following presentation of the search array (Juan et al., SfN 2003). Critically, eye movements evoked on antisaccade trials never deviated toward the singleton but only toward the stimulus location opposite the singleton. In our original report the singleton appeared at only two of the four locations in the array, always orthogonal to the evoked saccade baseline, which resulted in negligible RT difference...Oct 24, 2004