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Components in the visual processing of known and unknown faces

G A Carlesimo1, C Caltagirone

  • 1Clinica Neurologica, Università di Roma Tor Vergata, Italy.

Journal of Clinical and Experimental Neuropsychology
|October 1, 1995
PubMed
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The right hemisphere, particularly posterior regions, is crucial for human face visual processing. Prosopagnosia (PA) patients with right posterior lesions show impaired face recognition and age attribution.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Facial processing is a complex cognitive function essential for social interaction.
  • Disorders like prosopagnosia (PA) highlight the neural underpinnings of face perception.
  • Understanding the specific brain regions and mechanisms involved in facial recognition is critical.

Purpose of the Study:

  • To investigate the neural basis of visual face processing disorders.
  • To elucidate the cognitive mechanisms underlying prosopagnosia and related deficits.
  • To determine the role of specific brain regions, particularly the right hemisphere, in facial recognition and attribute attribution.

Main Methods:

  • Administered visual matching of unfamiliar faces, famous face identification, and age attribution tasks.

Related Experiment Videos

  • Studied two patients with prosopagnosia (PA), 45 brain-damaged patients, and 52 healthy controls.
  • Utilized neuroradiological and Positron Emission Tomography (PET) examinations for lesion localization.

    • Main Results:

    • Confirmed the critical role of the right hemisphere, especially posterior regions, in all aspects of facial processing.
    • PA patients with lesions in the right posterior cerebral artery territory exhibited the poorest performance across all tasks.
    • Deficient familiar face recognition was primarily mnestic, while age attribution deficits correlated with perceptual analysis impairments.

    Conclusions:

    • Right posterior brain lesions significantly impair facial processing abilities.
    • Familiar face recognition deficits are largely memory-related (mnestic), distinct from perceptual issues.
    • Age attribution difficulties are linked to deficits in the perceptual analysis of unfamiliar faces.