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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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Sensory Perception: Organization of the Somatosensory System01:11

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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:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the...
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Overview of Somatic Sensory Pathways01:29

Overview of Somatic Sensory Pathways

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
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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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Updated: Jan 6, 2026

Multiscale Investigations of Cortical Processing by Integrating Laminar Polytrodes and Optogenetics with Micro Electrocorticography in Rodents
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CT-Optimal Stimulation Modulates Somatosensory Processing.

A Ribeiro-Carreira1, Márcia da-Silva1, Ana Rita Pereira1

  • 1Psychological Neuroscience Laboratory (PNL), Research Center in Psychology (CIPsi), School of Psychology, Universidade do Minho, Braga, Portugal.

Psychophysiology
|September 8, 2025
PubMed
Summary
This summary is machine-generated.

Gentle touch via C-tactile (CT) afferents does not alter early cortical processing of somatosensory evoked potentials (SEPs). However, CT stimulation may modulate later processing, potentially influencing attention and cognitive functions.

Keywords:
C‐tactile fibersaffective touchsomatosensationsomatosensory evoked potentials

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Area of Science:

  • Neuroscience
  • Somatosensory System
  • Afferent Pathways

Background:

  • The affective dimension of touch is mediated by C-tactile (CT) afferents, activated by gentle, caress-like stimuli.
  • While CT afferents influence pain perception, their effect on other somatosensory processing is not well understood.

Purpose of the Study:

  • To investigate how CT-afferent stimulation modulates somatosensory evoked potentials (SEPs).
  • To compare the effects of slow brushing (CT-optimal) versus vibrotactile stimulation (A-beta optimal) on SEPs.

Main Methods:

  • 30 healthy participants received slow brushing (CT-optimal), vibrotactile stimulation, or no touch.
  • Somatosensory evoked potentials (SEPs) were elicited by median nerve electrical stimulation.
  • SEPs were recorded over the somatosensory cortex under the three tactile conditions.

Main Results:

  • No significant differences in early SEP components (N20, P25, N30, P45) were observed across conditions.
  • A reduction in the frontocentral P150 SEP component was noted during slow brushing compared to vibration and no touch.
  • This suggests CT stimulation may attenuate somatosensory input via the lemniscal pathway.

Conclusions:

  • CT-afferent stimulation does not appear to affect early cortical processing of somatosensory information.
  • CT stimulation might modulate later somatosensory processing, potentially involving attentional and cognitive brain networks.
  • Further research is needed to elucidate the precise mechanisms of CT afferent influence on sensory processing.