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Related Experiment Videos

Age differences in hemispheric activation to sensory condition

D M Shapiro1, W D Crews, D W Harrison

  • 1University of Virginia Health Sciences Center Charlottesville 22908, USA.

The International Journal of Neuroscience
|November 1, 1996
PubMed
Summary

Sensory conditions like light and noise affect hand strength differently in younger and elderly women, suggesting varied brain hemisphere activation. This difference is linked to the hemiaging hypothesis.

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Area of Science:

  • Neuroscience
  • Human Factors Engineering
  • Gerontology

Background:

  • Sensory processing and environmental factors can influence motor performance.
  • Age-related changes in cerebral hemisphere function, known as hemiaging, may impact motor control.
  • Understanding these interactions is crucial for optimizing performance and safety across age groups.

Purpose of the Study:

  • To investigate the impact of combined bright/dim light and noise levels on hand strength, fatigue, motor perseveration, and tapping rate.
  • To examine age-related differences (undergraduate vs. elderly females) in response to varying sensory conditions.
  • To explore the relationship between sensory intensity, hand strength asymmetry, and cerebral hemisphere activation.

Main Methods:

  • Assessed grip strength, fatigue, motor perseveration, and tapping rate in 13 undergraduate and 13 elderly females.

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  • Manipulated light intensity (bright/dim) and noise levels as independent variables.
  • Analyzed hand strength asymmetry (right vs. left) under different sensory conditions.

    • Main Results:

    • Sensory intensity increments caused opposing effects on left and right hand grip strength.
    • Younger females showed reliable right-hand dominance in bright light, but not dim light.
    • Elderly females exhibited hand strength asymmetry influenced by the combined light and noise intensity.

    Conclusions:

    • Increased sensory conditions may differentially activate cerebral hemispheres in elderly and younger individuals, affecting grip strength.
    • Findings support the hemiaging hypothesis, indicating age-related alterations in sensory-motor integration.
    • Environmental factors interact with age-related neural changes to modulate motor performance.