Pictorial similarity judgments and the organization of visual memory in the rhesus monkey

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Tested 2 male rhesus monkeys in a same/different task in which sequentially presented pictures were compared to each other in a pairwise fashion. The resulting confusion matrices were analyzed using a multidimensional scaling procedure to obtain 2- and 3-dimensional graphic representations of the stimulus space. In Exp I, the Ss' confusion errors caused pictures of human and rhesus monkey faces to fall in the same region of multidimensional space, which suggested that the Ss categorized facial stimuli. A similar effect was found for pictures of different types of fruit. Exp II replicated the categorization of faces with a more diverse collection of human and nonhuman primate faces. Exp III explored the fruit category by varying stimulus attributes orthogonally. Results show that both Ss encoded the pictures in this category by type of fruit (apples or grapes) and color (red or yellow). Taken together, these studies indicate that rhesus monkeys will treat some classes of pictorial stimuli categorically in visual memory. (46 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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