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Related Concept Videos

Somatosensation01:33

Somatosensation

43.0K
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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Major Somatic Sensory Pathways01:28

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Corticospinal Excitability Modulation During Action Observation
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Moderate manipulation to somatosensory feedback does not affect Libet-style intentional action.

Yu Hei Shum1, Carl Michael Galang2, Marcel Brass2

  • 1Berlin School of Mind and Brain & Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany. shumyuhe@hu-berlin.de.

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|September 9, 2025
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Summary

Free will debates question if unconscious brain activity precedes conscious decisions. This study found that blocking somatosensory feedback did not alter decision-making timing, suggesting it doesn't significantly influence arbitrary choices.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Philosophy of Mind

Background:

  • Benjamin Libet's experiment questioned free will, suggesting unconscious brain activity (readiness potential/RP) precedes conscious decisions.
  • Alternative theories propose RP reflects accumulating signals reaching an intention threshold, but the source of these signals for arbitrary decisions is unclear.
  • Interoceptive signals (e.g., cardiac, respiratory) are implicated in guiding arbitrary decisions.

Purpose of the Study:

  • To investigate whether somatosensory feedback from the afferent system contributes to the signals accumulated during arbitrary decision-making.
  • To test if disrupting somatosensory feedback by inducing hand numbness affects the time to reach a decision threshold.

Main Methods:

  • Participants performed arbitrary decisions after their hands were made numb to block somatosensory feedback.
  • Bayesian analyses were used to compare evidence for the experimental hypothesis against the null hypothesis.

Main Results:

  • Bayesian analyses provided decisive evidence supporting the null hypothesis.
  • There was no significant difference in decision-making time when somatosensory feedback was blocked.

Conclusions:

  • Somatosensory feedback does not appear to be a substantial source of information for arbitrary decisions.
  • The findings necessitate alternative explanations for the signals underlying arbitrary decision-making and the readiness potential.