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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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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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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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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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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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Related Experiment Video

Updated: Mar 29, 2026

A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
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Deviant Processing in the Primary Somatosensory Cortex.

Simon Musall1,2,3, Florent Haiss2,4,5, Bruno Weber2,3

  • 1Brain Research Institute.

Cerebral Cortex (New York, N.Y. : 1991)
|December 3, 2015
PubMed
Summary
This summary is machine-generated.

Stimulus-specific adaptation (SSA) mechanisms in the rat somatosensory cortex were investigated. Results show SSA is generated within cortex, with a late deviant response indicating true deviance detection.

Keywords:
local field potentialsmismatch negativitysensory processingsingle neuronsstimulus-specific adaptation

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Area of Science:

  • Neuroscience
  • Sensory Processing
  • Somatosensory Cortex Research

Background:

  • Stimulus-specific adaptation (SSA) is theorized to filter sensory information.
  • Mechanisms of SSA and cortical deviance detection remain unclear.

Purpose of the Study:

  • To investigate the neural mechanisms underlying SSA and deviance detection in the rat somatosensory cortex.
  • To characterize single-neuron and local field potential responses to deviant stimuli.

Main Methods:

  • Utilized an oddball paradigm with multicontact electrodes in rat somatosensory cortex.
  • Recorded neural responses to various deviant stimuli across different repetition rates (0.25-80 Hz).

Main Results:

  • Robust SSA observed in individual cortical neurons, varying with stimulus repetition rates.
  • SSA was weakest in the granular layer and stronger in supra- and infragranular layers, suggesting intracortical generation.
  • A subset of granular layer neurons exhibited a late, deviant-specific response (~200 ms post-stimulus), indicating true deviance detection beyond input depression.

Conclusions:

  • Cortical processing actively amplifies deviant responses.
  • An additional late neural component contributes to context-specific sensory deviance detection.
  • Deviance detection is an integral part of intracortical stimulus processing.