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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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Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
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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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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Related Experiment Video

Updated: Oct 14, 2025

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Adapting the visuo-haptic perception through muscle coactivation.

Gerolamo Carboni1, Thrishantha Nanayakkara2, Atsushi Takagi3

  • 1Imperial College of Science, Technology and Medicine, SW7 2AZ, London, UK. gerolamo.carboni16@imperial.ac.uk.

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Summary

The nervous system can voluntarily coactivate muscles to enhance touch-based perception (haptic percept). With practice, individuals learn to optimally combine visual and haptic information for improved motion planning.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Perception

Background:

  • The nervous system coordinates muscle activation for environmental interaction.
  • The influence of arm muscle coactivation on visuo-haptic perception and motion planning remains unclear.

Purpose of the Study:

  • To investigate if and how voluntary muscle coactivation impacts visuo-haptic perception and motion planning.
  • To determine if the nervous system can improve haptic percept quality through muscle coactivation.

Main Methods:

  • Participants tracked a moving visual target coupled via a virtual elastic band.
  • Band stiffness increased with wrist muscle coactivation.
  • Tracking performance was analyzed based on visual-only, haptic-enhanced, and combined sensory integration.

Main Results:

  • Voluntary muscle coactivation was shown to improve the quality of the haptic percept.
  • Participants learned to integrate visual and haptic information in a Bayesian manner with practice.
  • Performance improvements were not solely due to increased mechanical guidance from the elastic band.

Conclusions:

  • The nervous system can voluntarily coactivate muscles to enhance haptic perception.
  • With practice, the brain optimally integrates novel haptic percepts with visual information.
  • This suggests adaptive learning in sensory integration for improved motor control.