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Related Concept Videos

Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

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Related Experiment Video

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Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
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Sensorimotor performance asymmetries predict hand selection.

A Przybyla1, C J Coelho, S Akpinar

  • 1Department of Kinesiology, Pennsylvania State University, 29 Recreation Building, University Park, PA 16802, USA.

Neuroscience
|November 1, 2012
PubMed
Summary
This summary is machine-generated.

Handedness choice results from brain-body interactions. Removing visual input boosts non-dominant arm use, especially for midline targets, supporting the dynamic dominance hypothesis of handedness.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Handedness is typically assessed via questionnaires, but these don't explain the neurobehavioral basis of hand preference.
  • Handedness is linked to hemispheric specializations in sensorimotor performance.
  • The choice of hand for a task may arise from interactions between neurobehavioral asymmetries and task conditions.

Purpose of the Study:

  • To investigate how task conditions, specifically workspace region and visual feedback, influence hand choice in targeted reaching movements.
  • To test the hypothesis that hand preference results from an interaction between underlying neurobehavioral asymmetries and task demands.

Main Methods:

  • Manipulated workspace region and visual feedback during targeted reaching tasks.
  • Assessed arm choice in relation to geometric and dynamic task requirements and sensorimotor performance asymmetries.
  • Analyzed the interaction between task factors and arm selection.

Main Results:

  • Removing visual feedback improved the relative performance of the non-dominant arm.
  • Visual feedback removal increased the preference for using the non-dominant arm for targets near the body midline.
  • This effect was more pronounced for targets requiring larger movement amplitudes.

Conclusions:

  • Findings support the dynamic dominance hypothesis of handedness.
  • Demonstrates a link between hemispheric asymmetries in neural control and observable hand preference.
  • Highlights the role of task-specific sensorimotor demands in modulating hand choice.