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Related Experiment Videos

Face processing, laterality and contrast sensitivity.

F Newcombe1, E H de Haan, J Ross

  • 1MRC Neuropsychology Unit, Radcliffe Infirmary, Oxford, U.K.

Neuropsychologia
|January 1, 1989
PubMed
Summary
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Brain injury impacts person recognition. Right hemisphere damage slows facial recognition, while left hemisphere damage affects name recognition, revealing distinct cognitive processing pathways.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Person recognition is crucial for social interaction.
  • Unilateral brain injuries can lead to specific cognitive deficits.
  • Understanding hemispheric specialization in face and name processing is important.

Purpose of the Study:

  • To investigate the effects of unilateral brain injury on facial representation construction.
  • To examine the impact of brain lesions on basic person recognition (familiarity).
  • To explore hemispheric differences in processing faces versus written names.

Main Methods:

  • Two reaction time studies were conducted with ex-servicemen with unilateral brain injuries.
  • Experiment 1: Assessing facial representation by distinguishing faces from non-faces.

Related Experiment Videos

  • Experiment 2: Measuring familiarity awareness using faces and written names as stimuli; spatial contrast sensitivity was also measured.

    • Main Results:

    • Posterior right hemisphere (RH) lesions slowed facial representation construction compared to left hemisphere (LH) and controls.
    • RH-injured individuals showed slower reaction times to faces, while LH-injured individuals were slower with written names.
    • Both LH and RH injured groups had impaired contrast sensitivity, but no hemispheric difference was observed, indicating a double dissociation.

    Conclusions:

    • Right hemisphere damage specifically impairs the ability to construct facial representations.
    • Distinct hemispheric specializations exist for face and name recognition.
    • A double dissociation between contrast sensitivity and face processing impairments was observed.