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Related Concept Videos

Somatosensation01:33

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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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Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
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Somatosensory temporal discrimination threshold changes during motor learning.

Naoshin Yoshida1,2, Tomotaka Suzuki3, Kakuya Ogahara1,3

  • 1Unit of Rehabilitation Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.

Somatosensory & Motor Research
|October 16, 2020
PubMed
Summary

Motor learning improves tactile temporal processing. The somatosensory temporal discrimination threshold, which measures tactile timing perception, decreased as participants learned a coin rotation task, indicating enhanced sensory discrimination with practice.

Keywords:
Coin rotation taskmotor learningsensorimotor integrationsensory informationsomatosensory temporal discrimination threshold

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Area of Science:

  • Neuroscience
  • Motor Control
  • Sensory Perception

Background:

  • Motor learning refines motor control but its impact on tactile temporal processing is not well understood.
  • The somatosensory temporal discrimination threshold (sTDT) assesses the ability to perceive the timing of tactile stimuli.

Purpose of the Study:

  • To investigate changes in the sTDT during motor learning in a feedback-controlled task.
  • To explore the relationship between motor skill acquisition and tactile temporal processing.

Main Methods:

  • 15 healthy participants performed a 10-session coin rotation task.
  • The sTDT was measured on the index finger before, during, and after training.
  • Task performance (coin rotation score) and sTDT were compared across different training stages.

Main Results:

  • Participants showed significant improvement in the coin rotation task performance.
  • The sTDT significantly decreased after 5 and 10 training blocks compared to baseline.
  • Differences in sTDT were observed between hands post-training.

Conclusions:

  • Motor learning in a feedback-control task leads to enhanced tactile temporal discrimination.
  • Improved performance in a motor task is associated with a reduced sTDT, suggesting refined sensory processing.