Abstract
At 1 year and 2.5 years of age, rhesus monkeys were removed from the colony to a strange situation. Upon introduction, each monkey was watched for 2 hr, given a series of behavioural tests, and watched again six days after introduction. Activity increased with age, as did readiness to approach a ball. Time spent looking at a mirror decreased with age. Although test measures were reliable at each age, there was no significantly positive correlation from one age to the next. Nevertheless, with males, but not females, significant correlations occurred at each age between behaviour in the strange situation and observers’ ratings of behaviour in the colony.
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Stevenson-Hinde, J., Stillwell-Barnes, R. & Zunz, M. Individual differences in young rhesus monkeys: Consistency and change. Primates 21, 498–509 (1980). https://doi.org/10.1007/BF02373838
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DOI: https://doi.org/10.1007/BF02373838