The role of expression and identity in the face-selective responses of neurons in the temporal visual cortex of the monkey

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Neurophysiological studies have shown that some neurons in the cortex in the superior temporal sulcus and the inferior temporal gyrus of macaque monkeys respond to faces. To determine if facial factors such as expression and identity are encoded independently by face-responsive neurons, 45 neurons were tested on a stimulus set depicting 3 monkeys with 3 expressions each. As tested on a two-way ANOVA, 15 neurons showed response differences to different identities independently of expression, and 9 neurons showed responses to different expessions independently of identity. Three neurons showed significant effects of both factors. Six of the neurons with responses related to expression responded primarily to calm faces, while 2 responded primarily to threat faces. Of a further set of 31 neurons tested on pairs of different expressions, 6 showed strong responses to open-mouth fear or threat expressions, while 2 showed stronger responses to calm faces than threat expressions. Neurons responsive to expression were found primarily in the cortex in the superior temporal sulcus, while neurons responsive to identity were found primarily in the inferior temporal gyrus. The difference in anatomical distribution was statistically significant. This supports the possibility that specific impairments of the recognition of the identity of a face and of its expression in man are due to damage to or disconnection of separate neuronal substrates.

References (37)

  • BowersD. et al.

    Dissociation between the processing of affective and non-affective faces: a case study

    J. Clin. Neuropsychol.

    (1984)
  • BrosgoleL. et al.

    The mechanism underlying facial affective agnosia in senile demented patients

    Int. J. Neurosci.

    (1981)
  • BruceC. et al.

    Visual properties of neurons in a polysensory area in superior temporal sulcus of the macaque

    J. Neurophysiol.

    (1981)
  • BruceV. et al.

    Understanding face recognition

    Br. J. Psychol.

    (1986)
  • BucherK. et al.

    Anterior temporal cortex and maternal behavior in monkey

    Neurology (Minneapl.)

    (1970)
  • DamasioA.R. et al.

    Prosopagnosia: anatomic basis and behavioral mechanisms

    Neurology

    (1982)
  • FranzenE.A. et al.

    Neural control of social behavior: prefrontal and anterior temporal neocortex

    Neuropsychologia

    (1972)
  • FriedI. et al.

    Organization of visuospatial functions in human cortex: evidence from electrical stimulation

    Brain

    (1982)
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    *

    Present address: Division of Biology, California Institute of Technology, Pasadena, CA, 91125, U.S.A.

    **

    Present address: Department of Psychology, University of California at San Diego, La Jolla, California, U.S.A.

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