Rhesus monkeys (Macaca mulatta) lack expertise in face processing.

Bibliographic Collection: 
MOCA Reference, APE
Publication Type: Journal Article
Authors: Parr, Lisa A; Heintz, Matthew; Pradhan, Gauri
Year of Publication: 2008
Journal: J Comp Psychol
Volume: 122
Issue: 4
Pagination: 390-402
Date Published: 2008 Nov
Publication Language: eng
ISSN: 0735-7036
Keywords: Animals, Attention, Biological Evolution, Discrimination Learning, Face, Female, Macaca mulatta, Male, Orientation, Pattern Recognition, Visual, Perceptual Distortion, Perceptual Masking, Recognition (Psychology), Species Specificity

Faces are salient stimuli for primates that rely predominantly on visual cues for recognizing conspecifics and maintaining social relationships. While previous studies have shown similar face discrimination processes in chimpanzees and humans, data from monkeys are unclear. Therefore, three studies examined face processing in rhesus monkeys using the face inversion effect, a fractured face task, and an individual recognition task. Unlike chimpanzees and humans, the monkeys showed a general face inversion effect reflected by significantly better performance on upright compared to inverted faces (conspecifics, human and chimpanzees faces) regardless of the subjects' expertise with those categories. Fracturing faces alters first- and second-order configural manipulations whereas previous studies in chimpanzees showed selective deficits for second-order configural manipulations. Finally, when required to individuate conspecific's faces, i.e., matching two different photographs of the same conspecific, monkeys showed poor discrimination and repeated training. These results support evolutionary differences between rhesus monkeys and Hominoids in the importance of configural cues and their ability to individuate conspecifics' faces, suggesting a lack of face expertise in rhesus monkeys.

DOI: 10.1037/0735-7036.122.4.390
Alternate Journal: J Comp Psychol
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