Abstract
Using behaviourally-defined adjectives and a 7-point scale, observers rated all individuals over a year old in a colony of rhesus monkeys every November for four years. Principal component analyses of the ratings provided a basis for the following scores each year: CONFIDENT, EXCITABLE, and SOCIABLE. Two- and three-year old females had higher EXCITABLE scores than males, and adult males were more CONFIDENT than adult females. At all ages, CONFIDENT scores were stable from year to year, whereas EXCITABLE and SOCIABLE scores were not stable until adulthood. However for primiparous females, only their EXCITABLE scores were stable from the ante-natal to post-natal year. One-year males who had had adverse experience in their first eight months were more EXCITABLE, but no less CONFIDENT or SOCIABLE than control males. Finally, correlations between scores of mothers and their yearlings showed that CONFIDENT mothers had CONFIDENT infants and SOCIABLE mothers had SOCIABLE infants, but EXCITABLE mothers had infants who were not CONFIDENT. Scores of mothers and their 1-year olds were also significantly correlated with some measures of their social behaviour taken when the infants were 8, 16, and 52 weeks old.
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Stevenson-Hinde, J., Stillwell-Barnes, R. & Zunz, M. Subjective assessment of rhesus monkeys over four successive years. Primates 21, 66–82 (1980). https://doi.org/10.1007/BF02383825
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DOI: https://doi.org/10.1007/BF02383825