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Eye Orientation during Visual Discrimination Learning by Humans

Motion pictures were taken of the eyes of human Ss as they learned simultaneous two-choice pattern discriminations. Each trial was analyzed in two parts: the pre-stimulus phase (time before the onset of the stimuli) and the stimulus phase (time during which the stimuli were present). Ss looked more at one of the two discriminanda (the left or right) during one or both of those phases of the trial. These gaze-position preferences were not accompanied by response-position preferences, nor were there any correlations between eye, hand, and gaze preferences. In addition, all Ss looked more at the correct than at the incorrect stimulus.