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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.

Somatosensory, Motor, and Association Cortex

Somatosensory, Motor, and Association Cortex

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...

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Related Experiment Video

Updated: Jun 8, 2026

Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans

Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans

Published on: May 19, 2016

Multi-frequency phase locking in human somatosensory cortex.

Angela J Langdon¹, Tjeerd W Boonstra, Michael Breakspear

¹School of Psychiatry, University of New South Wales, Sydney, Australia. a.langdon@unsw.edu.au

Progress in Biophysics and Molecular Biology

|September 28, 2010

Summary

This summary is machine-generated.

Cortical brain activity shows n:m phase synchronization with periodic touch. This collective nonlinear response, especially around 30 Hz, reveals intrinsic dynamics in sensory encoding.

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Testing Tactile Masking between the Forearms

Testing Tactile Masking between the Forearms

Published on: February 10, 2016

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Last Updated: Jun 8, 2026

Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans

Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans

Published on: May 19, 2016

Testing Tactile Masking between the Forearms

Testing Tactile Masking between the Forearms

Published on: February 10, 2016

Area of Science:

Neuroscience
Computational Neuroscience
Biophysics

Background:

Cortical population responses integrate external stimuli with intrinsic neuronal dynamics.
Understanding large-scale neuronal activity during periodic stimulation is crucial for brain modeling.

Purpose of the Study:

Investigate collective neuronal responses to periodic vibrotactile stimuli.
Elucidate mechanisms of large-scale neuronal activity and stimulus encoding.

Main Methods:

Recorded electroencephalographic (EEG) data from human subjects.
Applied periodic vibrotactile stimuli to the fingertip.
Performed time-frequency decomposition to analyze power and phase distributions.

Main Results:

Observed n:m phase synchronization between cortical oscillations and stimulus frequencies (e.g., 1:1, 2:1, 2:3).
Phase-locked oscillatory activity was most robust around 30 Hz.
No robust frequency-locked power changes were detected.

Conclusions:

Neuronal populations exhibit collective nonlinear responses to periodic sensory input.
n:m phase synchronization highlights the role of intrinsic cortical dynamics in stimulus encoding.
Provides a novel criterion for validating large-scale brain models.