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Related Concept Videos

Somatosensation01:33

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.
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...
Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

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 stimulus...
The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
Sensory Functions of the Skin01:16

Sensory Functions of the Skin

The skin is the largest organ of the human body and plays a crucial role in our sensory perception. It contains a vast network of sensory receptors that contribute to the skin's protective function by perceiving physical, biological, and environmental cues and generating relevant responses.
There are two main categories of receptors on the skin: capsulated and non-capsulated. The non-capsulated ones are mainly the pain receptors. The capsulated ones can be further categorized based on the...
Sensory Modalities01:15

Sensory Modalities

Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
General senses refer to the broad category of sensory information detected by receptors in the body and can be further grouped into somatic and visceral senses. Somatic sensations include touch, pressure, temperature, and pain and are essential for navigating our environment and...

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Related Experiment Video

Updated: Jun 23, 2026

Multiscale Investigations of Cortical Processing by Integrating Laminar Polytrodes and Optogenetics with Micro Electrocorticography in Rodents
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Sparse temporal coding of elementary tactile features during active whisker sensation.

Shantanu P Jadhav1, Jason Wolfe, Daniel E Feldman

  • 1Computational Neurobiology Graduate Program, University of California, San Diego, La Jolla, California, USA.

Nature Neuroscience
|May 12, 2009
PubMed
Summary

The brain uses sparse, precisely timed neural spikes in the somatosensory cortex (S1) to encode tactile information from whisker movements. These slip-stick events are crucial for rats to perceive surface properties during active sensation.

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Area of Science:

  • Neuroscience
  • Sensory Neuroscience
  • Computational Neuroscience

Background:

  • Understanding how the brain processes sensory information during active exploration is a key challenge.
  • Rodent whiskers generate complex micro-motions, including slip-stick events, during tactile sensation, which convey surface property information.

Purpose of the Study:

  • To investigate how the brain encodes relevant sensory stimuli during active natural sensation.
  • To elucidate the neural mechanisms underlying tactile perception in rodents via whisker activity.

Main Methods:

  • Simultaneous measurement of whisker motion and neural activity in the rat somatosensory cortex (S1).
  • Analysis of neural responses to slip-stick events during whisking across different surfaces.

Main Results:

  • Slip-stick motion events are encoded by sparse, precisely timed spikes in S1 neurons, forming a probabilistic ensemble code.
  • Efficient decoding of slips is possible from correlated spiking within small neural populations on a ~20 ms timescale.
  • Slip responses significantly increase firing rate and transient synchrony, with synchrony being a key cue for surface texture.

Conclusions:

  • Slip-stick events are fundamental encoded tactile features in natural whisker input.
  • Sparse, temporally precise, and synchronous spiking in S1 represents these critical tactile features.
  • This neural code enables efficient perception of surface properties during active exploration.