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Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
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Published on: January 15, 2016

Position sense asymmetry.

Diane E Adamo1, Bernard J Martin

  • 1Institute of Gerontology, Wayne State University, 226 Knapp Building, 87 East Ferry Street, Detroit, MI 48202, USA. dadamo@wayne.edu

Experimental Brain Research
|September 23, 2008
PubMed
Summary
This summary is machine-generated.

Asymmetries in upper limb position sense are not due to hemispheric differences but rather distinct sensory-motor loop gains. This study investigated wrist position matching to reveal these proprioceptive processing differences.

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Area of Science:

  • Neuroscience
  • Human Motor Control
  • Proprioception

Background:

  • Upper limb position sense asymmetries are often attributed to hemispheric specialization for kinesthetic processing.
  • The contribution of comparing passive limb displacement perception with active motor command execution to these asymmetries is unclear.

Purpose of the Study:

  • To investigate upper limb position sense asymmetries in right-hand-dominant adults.
  • To explore the influence of interhemispheric transfer, memory retrieval, and limb-matching conditions on position sense accuracy.

Main Methods:

  • 12 right-hand-dominant young adults performed wrist position matching tasks.
  • Tasks involved matching reference positions using the same or opposite limb.
  • Absolute and constant errors were analyzed to assess position sense accuracy.

Main Results:

  • Matching errors were similar for same-limb tasks but 36% greater for opposite-limb tasks.
  • Opposite-limb matching showed significant overshoot (right hand matching left reference) and undershoot (left hand matching right reference).
  • Errors suggest differences in the gain of proprioceptive sensory-motor loops, not solely central processing asymmetries.

Conclusions:

  • Asymmetries in upper limb position sense may predominantly stem from differing gains in proprioceptive sensory-motor loops.
  • A dual-linear model supports this hypothesis, integrating morphological and physiological data.
  • Findings challenge traditional explanations based solely on interhemispheric transfer differences.