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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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Reach Trajectories Characterize Tactile Localization for Sensorimotor Decision Making.

Janina Brandes1, Tobias Heed2

  • 1Biological Psychology and Neuropsychology, Faculty of Psychology and Human Movement Science, University of Hamburg, 20146 Hamburg, Germany janina.brandes@uni-hamburg.de.

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Summary

When touching oneself, the brain rapidly integrates skin sensation location with body posture to guide movements. Limb crossing does not impair this tactile spatial transformation process, showing efficient sensorimotor integration.

Keywords:
footlimb crossingmotor controlremappingtouch

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Area of Science:

  • Neuroscience
  • Motor Control
  • Somatosensation

Background:

  • Movement planning typically uses gaze-centered reference frames.
  • Tactile spatial information is initially coded relative to the skin.
  • Integrating skin location and body posture is crucial for tactile-guided movements.

Purpose of the Study:

  • To investigate if limb crossing impairs tactile spatial recoding.
  • To determine if tactile spatial transformations are rapid and efficient.
  • To understand how skin-based and external information are integrated for reaching.

Main Methods:

  • Human participants performed a sensorimotor decision task involving reaching to visual and tactile targets.
  • Stimulus recoding was analyzed by examining hand reach trajectories (timing and spatial profile).
  • Targets were located at both uncrossed and crossed feet positions.

Main Results:

  • Hand reach trajectories to visual targets were unaffected by foot crossing.
  • Reaches to tactile targets were redirected later when feet were crossed compared to uncrossed.
  • Tactile reaches to crossed feet were not biased by skin-based location, indicating rapid recoding.

Conclusions:

  • Tactile spatial transformations are not impaired by limb crossing.
  • The process of recoding tactile location and integrating it with body posture is quick and efficient.
  • This integration aligns with bounded integrator decision-making frameworks.