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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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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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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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Related Experiment Video

Updated: Dec 18, 2025

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Somatosensory-visual effects in visual biological motion perception.

Pierre Progin1,2,3, Nathan Faivre1,3,4, Anna Brooks5,6

  • 1Department of Psychiatry, Service of General Psychiatry, Lausanne University Hospital (CHUV), Lausanne, Switzerland.

Plos One
|June 12, 2020
PubMed
Summary

Tactile foot stimulation enhances the perception of biological motion (BM), specifically visual walking patterns. This effect occurs when touch cues align synchronously with seen footsteps on the feet, improving speed discrimination.

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Area of Science:

  • Neuroscience
  • Perception Psychology
  • Human-Computer Interaction

Background:

  • Social cognition relies on interpreting human stimuli, with biological motion (BM) being crucial.
  • BM perception, particularly walking, is often studied visually but occurs with multisensory cues in real life.
  • Existing research suggests motor signals and cross-modal visuo-tactile interactions influence bodily perception.

Purpose of the Study:

  • To investigate how somatosensory (tactile) inputs affect the visual perception of biological motion (BM).
  • To determine if tactile stimulation influences the ability to discriminate the speed of observed walking patterns.
  • To assess the specificity of somatosensory-visual interactions in BM perception.

Main Methods:

  • Healthy participants performed a speed discrimination task on point light walkers (PLW).
  • Experiment 1 involved presenting PLW with tactile stimuli on forearms or feet soles.
  • Experiment 2 varied tactile stimulus synchronicity and PLW orientation (upright/inverted).

Main Results:

  • Somatosensory input, specifically tactile foot stimulation, significantly influenced visual BM perception.
  • Tactile foot cues, when synchronous with seen footsteps, enhanced sensitivity in the speed discrimination task.
  • This enhancement occurred regardless of whether the PLW was presented upright or inverted.

Conclusions:

  • Somatosensory-visual interactions play a role in biological motion perception.
  • Synchronous tactile input on relevant body parts (feet) modulates visual processing of walking.
  • Findings suggest specific mechanisms underlying cross-modal integration in perceiving human movement.