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Lateralization of kinesthetically guided spatial perception.

S Nishizawa1, C A Saslow

  • 1Department of Physical Education, Seitoku Junior College of Nutrition, Tokyo, Japan.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|September 1, 1987
PubMed
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The left thumb exhibits superior kinesthetic discrimination compared to the right thumb, demonstrating a ~20% smaller angular position threshold. This sensory difference was observed in right-handed individuals and was not influenced by sex or movement type.

Area of Science:

  • Neuroscience
  • Human Motor Control
  • Sensory Perception

Background:

  • Kinesthetic sense, or proprioception, is crucial for motor control and spatial awareness.
  • Lateralization of brain function suggests potential differences in sensory processing between the left and right limbs.

Purpose of the Study:

  • To investigate potential lateralization in unimanual kinesthetic discrimination of thumb angular position.
  • To compare the kinesthetic sensitivity of the left and right thumbs in right-handed individuals.

Main Methods:

  • Method of Constant Stimuli was employed to measure discrimination threshold and constant error for thumb angular position.
  • Participants included male and female right-handers without left-handed relatives.
  • Active and passive movement conditions, along with verbal and non-verbal responses, were assessed.

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Main Results:

  • A significant difference in kinesthetic discrimination was found, favoring the left thumb (controlled by the right hemisphere).
  • The left thumb demonstrated a smaller angular position discrimination threshold by approximately 20% compared to the right thumb.
  • No significant relationship was observed between sex, passive movement, verbal response, and the observed lateralization effect.

Conclusions:

  • The findings suggest a lateralization of kinesthetic sense, with the left thumb exhibiting enhanced angular position discrimination.
  • This enhanced sensitivity in the left thumb may be attributed to right-hemisphere processing.
  • Further research is needed to explore the neural mechanisms underlying this sensory lateralization.