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Related Concept Videos

Somatosensation01:33

Somatosensation

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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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Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Related Experiment Video

Updated: Jan 13, 2026

Recording Human Electrocorticographic ECoG Signals for Neuroscientific Research and Real-time Functional Cortical Mapping
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The Spatial Coding of Touch Is Defined in Intrinsic, Limb-Specific Coordinates: An EEG Study.

Valeria C Peviani1, Hüseyin O Elmas2, W Pieter Medendorp2

  • 1Donders Centre for Cognition, Radboud University, Nijmegen 6525GD, the Netherlands valeria.peviani@donders.ru.nl.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 7, 2026
PubMed
Summary

The human brain uses limb-specific, intrinsic coordinates to determine touch location, not limb-independent, extrinsic ones. This finding challenges the long-held assumption of extrinsic encoding in tactile remapping.

Keywords:
neural network modelingreference framessomatosensory evoked potentialstactile localizationtactile remappingtactile–proprioceptive integration

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Area of Science:

  • Neuroscience
  • Somatosensory processing
  • Spatial coding

Background:

  • The brain integrates tactile and proprioceptive signals for spatiotopic touch localization (tactile remapping).
  • Existing theories debate whether touch is mapped into extrinsic (limb-independent) or intrinsic (limb-specific) coordinates.
  • Neural activity in primate sensorimotor and parietal regions is known to encode limb position via amplitude gradients.

Purpose of the Study:

  • To investigate whether the human brain uses extrinsic or intrinsic spatial coding for tactile remapping.
  • To test predictions of extrinsic versus intrinsic coding schemes using electroencephalography (EEG).

Main Methods:

  • Utilized electroencephalography (EEG) and a novel tactile stimulation paradigm with hands in various body-relative positions.
  • Analyzed somatosensory evoked potentials (SEPs) for amplitude gradients reflecting limb position.
  • Employed both univariate and multivariate EEG analyses, alongside a neural network model.

Main Results:

  • Found no evidence supporting extrinsic coding of touch location.
  • Observed neural signatures indicative of intrinsic, limb-specific spatiotopic coding.
  • Identified early neural markers (around 160 ms) in centro-parietal channels, later shifting to other brain regions.
  • A neural network model successfully replicated the observed gradient patterns.

Conclusions:

  • The human brain localizes touch using an intrinsic, limb-specific spatial code.
  • This challenges the dominant assumption of extrinsic encoding in tactile remapping.
  • Demonstrates integration of tactile and postural information within cortical maps for spatial awareness.