Relationships among measures of visual exploration in monkeys.

Abstract
Six rhesus monkeys learned a series of different instrumental responses, each previously reported in studies of visual exploration. Visual incentive stimuli were identical for each response. Comparisons of mean response frequencies and mean total response durations of each response between pairs of incentives showed that a looking or observing response was most sensitive in detecting differences between incentive stimuli. Measures of several manual instrumental responses were less sensitive to the influences of different visual incentives. Independent measures of looking obtained concurrently with measures of manual instrumental responses showed that looking is relatively stable regardless of ongoing manual behavior.

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