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Behavioral tasks. The monkey's task was to shift gaze to a target stimulus during conjunction search with four (A) or six (B) stimuli, or a feature search with the target easy (C) or difficult (D) to discriminate from distractors. The discrimination in the difficult feature search was more difficult than depicted schematically in D.Dotted circles represent the monkey's current point of fixation; the arrow represents the saccade to the target. Stimuli are not drawn to scale.
