title: Do infant Japanese macaques ( Macaca fuscata) categorize objects without specific training?
abstract: In the present study, we examined whether infant Japanese macaques categorize objects without any training, using a similar technique also used with human infants (the paired-preference method). During the familiarization phase, subjects were presented twice with two pairs of different objects from one global-level category. During the test phase, they were presented twice with a pair consisting of a novel familiar-category object and a novel global-level category object. The subjects were tested with three global-level categories (animal, furniture, and vehicle). It was found that they showed significant novelty preferences as a whole, indicating that they processed similarities between familiarization objects and novel familiar-category objects. These results suggest that subjects responded distinctively to objects without training, indicating the possibility that infant macaques possess the capacity for categorization.
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D003071:Cognition; D003210:Concept Formation; D005795:Generalization, Stimulus; D007564:Japan; D008251:Macaca / Q000523:psychology*; D008297:Male