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Schematic diagram of the main task. Monkeys fixated a central fixation point while holding two bars, one with each hand. An array of search stimuli containing one target (an upward or downward facing T) and seven, 11, or 15 distractors was then presented at an eccentricity of 10°. The monkeys were free to move their eyes as they wished and were rewarded if they released the bar that corresponded to the target stimulus present in the array.
