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Effects of aging and gender on interhemispheric function.

T J Bellis1, L A Wilber

  • 1Department of Communication Disorders, University of South Dakota, Vermillion 57069, USA. tbellis@usd.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|April 28, 2001
PubMed
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Brain hemisphere communication via the corpus callosum declines in adults aged 40-55. This decline impacts auditory and visuomotor tasks, with gender influencing the rate of interhemispheric function changes.

Area of Science:

  • Neuroscience
  • Human Aging Research

Background:

  • The corpus callosum facilitates communication between brain hemispheres, crucial for sensory, motor, and cognitive functions.
  • Aging is associated with structural changes in the corpus callosum, potentially influenced by gender.
  • Age- and gender-related changes may impair functions reliant on interhemispheric integrity.

Purpose of the Study:

  • To examine how age and gender affect auditory and visuomotor temporal indices of interhemispheric function throughout adulthood.
  • To identify the lifespan period when interhemispheric function begins to decline.

Main Methods:

  • Studied 120 right-handed adults aged 20-75 years.
  • Assessed interhemispheric integrity using dichotic listening, auditory temporal patterning, and visuomotor interhemispheric transfer time tasks.

Related Experiment Videos

Main Results:

  • Interhemispheric integrity significantly decreases between ages 40 and 55, with no further decline afterward.
  • The trajectory of this decline differs between men and women for specific tasks.
  • Age-related decline in interhemispheric function was observed across auditory and visuomotor domains.

Conclusions:

  • Reduced interhemispheric function may contribute to age-related auditory and communication challenges.
  • Findings have implications for assessing interhemispheric function in aging adults.
  • Further research is needed on the functional consequences of declining interhemispheric transfer.