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Spatial bias and right hemisphere function: sex-specific changes with aging.

Peii Chen1, Kelly M Goedert2, Elizabeth Murray1

  • 11Kessler Foundation Research Center, West Orange, New Jersey.

Journal of the International Neuropsychological Society : JINS
|February 16, 2011
PubMed
Summary
This summary is machine-generated.

Cerebral asymmetry in spatial processing shows age-related changes that differ by sex. Older men exhibit rightward bias, while women maintain leftward bias, indicating sex-specific alterations in spatial systems.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Aging Research

Background:

  • Cerebral asymmetry influences visuospatial functions.
  • A leftward bias in line bisection tasks is common and may reflect this asymmetry.
  • Previous research suggests age-related decreases in this leftward bias.

Purpose of the Study:

  • To investigate sex-specific age-related changes in cerebral asymmetry.
  • To differentiate between "where" (perceptual-attentional) and "aiming" (motor-intentional) spatial biases.
  • To examine the relationship between these biases and aging in men and women.

Main Methods:

  • Line bisection task administered to men and women aged 22-93 years.
  • Fractionation of "where" and "aiming" spatial biases.
  • Analysis of age and sex effects on line bisection errors.

Main Results:

  • Older men showed increased rightward errors, primarily linked to the "where" spatial system.
  • Women's errors remained leftward biased and showed no significant age-related change.
  • These findings suggest sex-specific alterations in the aging spatial system.

Conclusions:

  • Age-related decline in right dorsal spatial activity may affect males but not females.
  • The "where" spatial system, potentially involving dorsal stream networks, is implicated.
  • Visuospatial processing and its neural underpinnings exhibit distinct trajectories in aging men and women.