Individuation and holistic processing of faces in rhesus monkeys

Christoph D. Dahl, Nikos K. Logothetis, Kari L. Hoffman

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Despite considerable evidence that neural activity in monkeys reflects various aspects of face perception, relatively little is known about monkeys' face processing abilities. Two characteristics of face processing observed in humans are a subordinate-level entry point, here, the default recognition of faces at the subordinate, rather than basic, level of categorization, and holistic effects, i.e. perception of facial displays as an integrated whole. The present study used an adaptation paradigm to test whether untrained rhesus macaques (Macaca mulatta) display these hallmarks of face processing. In experiments 1 and 2, macaques showed greater rebound from adaptation to conspecific faces than to other animals at the individual or subordinate level. In experiment 3, exchanging only the bottom half of a monkey face produced greater rebound in aligned than in misaligned composites, indicating that for normal, aligned faces, the new bottom half may have influenced the perception of the whole face. Scan path analysis supported this assertion: during rebound, fixation to the unchanged eye region was renewed, but only for aligned stimuli. These experiments show that macaques naturally display the distinguishing characteristics of face processing seen in humans and provide the first clear demonstration that holistic information guides scan paths for conspecific faces.

Original languageEnglish
Pages (from-to)2069-2076
Number of pages8
JournalProceedings of the Royal Society B: Biological Sciences
Volume274
Issue number1622
DOIs
Publication statusPublished - Sep 7 2007
Externally publishedYes

Keywords

  • Dishabituation
  • Face perception
  • Habituation
  • Inferotemporal cortex
  • Preferential looking
  • Scan path

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Environmental Science(all)
  • Agricultural and Biological Sciences(all)

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