Abstract
Adult titi monkeys react to novelty more strongly and cautiously than other New World primates. Developmental changes in responsiveness were assessed by presenting complex novel objects to family groups consisting of 11 male-female pairs and their adult (31–33 months), subadult (20–23 months), and juvenile offspring (10–16 months). Food and a simple block were included as control conditions. Differences in attraction to novel objects were inversely related to age. Juveniles approached more objects, more quickly, and spent more time near them than older subjects. Parents, the least responsive age-group, seemed more indifferent than cautious. Age-effects were smaller with the block, and negligible with food. Even in the most responsive age-group, investigatory behavior appeared subdued as compared to other primate species.
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