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Visual search task and behavior. A, Visual search task trial progression. The target is defined as the stimulus with higher contrast (contrast increment task). The arrow represents a correct response in which a single saccade is made to the target. B, Eye position traces from a single session (monkey G) during trials in which a saccade was directed to the search target before (thin lines) and after (thick lines) a 0.5 mg/kg ketamine injection.
