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Contribution of external reference frame to tactile localization.

Shunsuke Otsuka1, Han Gao2, Koichi Hiraoka3

  • 1College of Health and Human Sciences, Osaka Prefecture University, Habikino city, Japan.

Experimental Brain Research
|June 25, 2024
PubMed
Summary
This summary is machine-generated.

Proprioception aids in locating body parts within an external frame, but not tactile stimuli during passive limb movement. This suggests tactile localization relies on timing rather than external spatial cues.

Keywords:
Anatomical reference frameBiceps brachii musclePassive movementProprioceptionTactile perceptionVibration

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Area of Science:

  • Neuroscience
  • Human motor control
  • Sensory perception

Background:

  • Understanding how humans perceive their body's position in space is crucial for motor control.
  • The role of external reference frames versus internal sensory feedback in spatial awareness is a key area of research.

Purpose of the Study:

  • To investigate whether an external reference frame influences tactile localization during passive limb movement in humans.
  • To determine the contribution of proprioception to spatial coordinate identification.

Main Methods:

  • Participants performed passive forearm movements while blindfolded.
  • Tactile stimuli were applied to the hand, and participants indicated perceived locations.
  • Vibration was applied to the biceps brachii muscle to perturb proprioceptive input.

Main Results:

  • Proprioceptive input (biceps vibration) during passive movement altered the perceived location of the fingertip, indicating proprioception's role in external reference frame use.
  • Tactile stimulus localization on the hand was unaffected by proprioceptive perturbation, suggesting external frames do not contribute.

Conclusions:

  • Proprioception is essential for orienting body parts within an external reference frame.
  • Tactile localization during passive movement appears to rely on temporal cues (time of stimulus onset) rather than external spatial information.