ORIENTATION AND LEVER RESPONDING IN AUDITORY DISCRIMINATIONS IN SQUIRREL MONKEYS1

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Abstract
Head orientation during auditory discriminations was studied in squirrel monkeys using a two-lever trial-by-trial procedure. Animals were studied using auditory discriminations based on the position of the sound and on the spectral content differences between a pure tone and a noise. After the percentage of correct responses reached asymptote, head orientation was measured using videotape recordings. Orientation occurred on virtually every trial and was under the control of the position of the sound under all conditions. Lever responding was controlled by the same parameters of the sound under some conditions, and by different parameters in others. Orientation and lever responding were correlated (a lever response could be predicted from the direction of orientation) when both responses were under the control of the same parameter of the sound. The two responses were uncorrected when they were controlled by different parameters of the sound. Orientation and lever responding were not functionally related.

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