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Somatosensation

Somatosensation

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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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 the...

Sensory Perception: Organization of the Somatosensory System

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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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Related Experiment Video

Updated: Jul 13, 2026

Functional Mapping with Simultaneous MEG and EEG

Functional Mapping with Simultaneous MEG and EEG

Published on: June 14, 2010

From head to toe: Efficient somatosensory mapping with fast stimulation and multivariate pattern analysis.

Xaver Fuchs^1,2, Juliane Schubert^1,2, Tobias Heed^1,2

¹Cognitive Psychology, Department of Psychology, University of Salzburg, Salzburg, Austria.

Neuroimage. Reports

|July 12, 2026

Summary

Faster tactile stimulation protocols significantly improve the efficiency of somatosensory evoked potentials (SEPs) and multivariate pattern analysis (MVPA) without sacrificing data quality. This allows for more effective mapping of the human body

Keywords:

Classification Decoding EEG Somatosensory evoked potentials Tactile

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Last Updated: Jul 13, 2026

Functional Mapping with Simultaneous MEG and EEG

Functional Mapping with Simultaneous MEG and EEG

Published on: June 14, 2010

A Standardized Protocol for Functional Motor Mapping Using Navigated Transcranial Magnetic Stimulation

A Standardized Protocol for Functional Motor Mapping Using Navigated Transcranial Magnetic Stimulation

Published on: February 27, 2026

Area of Science:

Neuroscience
Human Sensory Systems
Electrophysiology

Background:

Somatosensory evoked potentials (SEPs) using electroencephalography (EEG) are crucial for studying tactile cortical responses.
Traditional SEP research often focuses on limited body parts and employs time-intensive protocols.
Optimizing SEP and multivariate pattern analysis (MVPA) efficiency is essential for broader application.

Purpose of the Study:

To evaluate the impact of faster tactile stimulation protocols on SEP and MVPA.
To compare the efficiency and data integrity of fast versus slow stimulation methods.
To explore body-part specific somatosensory representations using advanced analysis techniques.

Main Methods:

Fifteen participants underwent vibrotactile stimulation on the finger, hand, cheek, and foot.
EEG data were recorded using both traditional slow (800-1200 ms ISI) and accelerated fast (300-500 ms ISI) protocols.
Temporal and topographical features of SEPs and MVPA results were analyzed and compared.

Main Results:

Fast and slow protocols yielded comparable SEP components (P100, N140, P200) and topographies.
The fast protocol reduced testing time by approximately 60% while maintaining classification accuracy (up to ~55%).
SEPs demonstrated body-part specificity, with distinct temporal responses for different locations; MVPA accurately distinguished body parts, particularly around 100 ms post-stimulus.

Conclusions:

Accelerated stimulation protocols enhance efficiency in SEP and MVPA studies without compromising interpretability.
The combination of SEP analysis and MVPA offers complementary insights into somatosensory processing.
This integrated approach provides a robust framework for mapping somatosensory representations across the entire body.