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Related Experiment Videos

Handedness and dementia.

R I Naugle1, C M Cullum, E D Bigler

  • 1School of Medicine, University of California, San Diego.

Perceptual and Motor Skills
|August 1, 1987
PubMed
Summary

This study investigated if left-hand dominance impacts Alzheimer's disease progression. Researchers found no statistically significant difference in cognitive impairment between left-handed and right-handed dementia patients.

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Area of Science:

  • Neurology
  • Neuropsychology
  • Gerontology

Background:

  • Speculation exists regarding left-hand dominance and early-onset Alzheimer's disease.
  • Concerns include higher prevalence and more rapid disease course in left-handed individuals.

Purpose of the Study:

  • To compare neuropsychological impairment in left-handed versus right-handed dementia patients.
  • To investigate the relationship between handedness and Alzheimer's disease progression.

Main Methods:

  • Matched-pair study design comparing seven left-handed and seven right-handed dementia patients.
  • Participants were matched for age and years of education.
  • Neuropsychological assessments were used for comparison.

Main Results:

  • The left-handed dementia patient group showed slightly greater impairment than the right-handed group.
  • This observed difference in cognitive compromise did not reach statistical significance.
  • No significant link was found between left-hand dominance and accelerated Alzheimer's disease progression in this cohort.

Conclusions:

  • The study did not find statistically significant evidence to support the hypothesis that left-hand dominance is associated with greater Alzheimer's disease severity or a faster disease course.
  • Further research with larger sample sizes may be warranted to explore subtle differences.
  • Handedness does not appear to be a significant factor in the progression of Alzheimer's disease based on this investigation.

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