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Tactile gating in a reaching and grasping task.

Francisco L Colino1, Gavin Buckingham, Darian T Cheng

  • 1School of Health & Exercise Sciences, Faculty of Health & Social Development, The University of British Columbia, Kelowna, British Columbia, Canada.

Physiological Reports
|April 25, 2014
PubMed
Summary
This summary is machine-generated.

Sensory gating reduces tactile detection during movement. This study found that tactile detection decreased on the forearm before movement, but not on other body parts during a reach-to-grasp task.

Keywords:
Feed forwardreaching and graspingtactile gating

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Area of Science:

  • Neuroscience
  • Sensory processing
  • Motor control

Background:

  • Sensory systems are constantly bombarded with stimuli.
  • Sensory gating is crucial for filtering unimportant information.
  • Tactile suppression, a form of sensory gating, reduces tactile detection during movement.

Purpose of the Study:

  • To investigate how tactile detection changes during a reach-to-grasp movement.
  • To determine if tactile suppression varies based on the location of tactile stimulation and the effector limb.

Main Methods:

  • Fourteen participants performed a reach-to-grasp task with their right hand.
  • Vibratory stimuli were applied to tactors on the index finger, fifth digit, and forearm of both arms.
  • Tactile detection was assessed at various time points relative to movement onset.

Main Results:

  • Tactile detection rates decreased on the forearm before movement onset.
  • Detection rates did not decrease on the index finger, fifth digit, or contralateral forearm.
  • These findings suggest task-specific modulation of sensory gating.

Conclusions:

  • Motor planning processes influence sensory signal modulation.
  • Tactile suppression is dynamically regulated in a temporally and contextually dependent manner.
  • Feed-forward motor planning can modify sensory processing during voluntary movements.