The neural basis of categorical face perception: Graded representations of face gender in fusiform and orbitofrontal cortices

Jonathan B. Freeman, Nicholas O. Rule, Reginald B. Adams, Nalini Ambady

Research output: Contribution to journalArticlepeer-review

Abstract

Face gender, like many other things, is perceived categorically: Subjective perceptions are distorted toward the categories, male or female, and the objective gradiency inherent across faces is partially lost. The neural basis of such categorical face perception remains virtually unknown. Participants passively viewed faces whose sexually dimorphic content was morphed monotonically from male to female while neural activity was measured using functional magnetic resonance imaging. Subjective perceptions revealed strong nonlinearity despite monotonic linear changes in face gender, consistent with categorical perception. Neuroimaging results indicated that the lateral fusiform gyrus, bilaterally, and the fusiform face area linearly encoded graded parameters of objective face gender, but these regions correlated substantially less with subjective perceptions (which were nonlinear and affected by categorical perception effects). Such subjective perceptions, however, were represented in the orbitofrontal cortex, but this region correlated substantially less with objective parameters. The attention-independent graded representations of face gender in fusiform and orbitofrontal cortices reveal how objective face parameters are encoded and transformed into subjective categorically warped perceptions in the human brain.

Original languageEnglish (US)
Pages (from-to)1314-1322
Number of pages9
JournalCerebral Cortex
Volume20
Issue number6
DOIs
StatePublished - 2010

Keywords

  • Categorical perception
  • Face gender
  • Face perception
  • Functional magnetic resonance imaging
  • Fusiform cortex
  • Orbitofrontal cortex

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Cellular and Molecular Neuroscience

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