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Sex differences in functional brain asymmetry.

J McGlone1

  • 1Department of Psychology, University Hospital, London, Ontario, Canada.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 1, 1978
PubMed
Summary

Right-handed men show intellectual decline after brain injury, unlike women. This suggests greater functional brain asymmetry in men, impacting cognitive abilities differently based on sex.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuropsychology

Background:

  • Cerebral hemispheres are specialized for different cognitive functions.
  • Sex differences in brain lateralization and cognitive performance are documented.
  • Previous research indicates lateralization of intellectual functions in right-handed individuals.

Purpose of the Study:

  • To investigate sex differences in cognitive deficits following unilateral brain lesions.
  • To determine if functional brain asymmetry in intellectual abilities differs between men and women.

Main Methods:

  • Studied adult right-handed individuals with unilateral brain lesions.
  • Assessed verbal and nonverbal intelligence using standardized tests.
  • Compared cognitive performance based on lesion hemisphere and sex.

Main Results:

  • Right-handed men exhibited expected intellectual deficits (verbal with left, nonverbal with right lesions).
  • Right-handed women did not show selective verbal or performance deficits after unilateral brain injury.
  • Findings indicate sex-based differences in cognitive resilience to brain injury.

Conclusions:

  • Right-handed men display greater functional brain asymmetry for intellectual functions than right-handed women.
  • Sex influences the relationship between brain lateralization and cognitive outcomes.
  • Further research is needed to explore the neurobiological basis of these sex differences.

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