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Related Concept Videos

Somatosensation01:33

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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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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.
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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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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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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Sensory receptors are vital in our ability to perceive and interpret the world. Sensory receptors are specialized cells in the peripheral nervous system that respond to various stimuli and enable one to experience different sensations. Based on specific criteria, sensory receptors are classified into distinct types.
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Related Experiment Video

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Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
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Edge-orientation processing in first-order tactile neurons.

J Andrew Pruszynski1, Roland S Johansson1

  • 1Physiology Section, Department of Integrative Medical Biology, Umeå University, Umeå, Sweden.

Nature Neuroscience
|September 1, 2014
PubMed
Summary
This summary is machine-generated.

First-order tactile neurons in human fingertips use their complex receptive fields to detect edge orientation. The spatial arrangement of sensitive zones within these neurons predicts their orientation sensitivity.

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Area of Science:

  • Neuroscience
  • Somatosensation
  • Tactile Sensory Processing

Background:

  • First-order neurons in the tactile system possess complex receptive fields with multiple sensitive zones.
  • These complex receptive fields are formed by distal axon branching in the skin, creating numerous transduction sites.

Purpose of the Study:

  • To investigate the role of peripheral neural mechanisms in signaling geometric features of touched objects.
  • To determine how first-order tactile neurons encode edge orientation.

Main Methods:

  • Examined two types of first-order tactile neurons innervating human glabrous fingertips.
  • Analyzed neuronal responses (intensity and temporal structure) to tactile stimuli.
  • Correlated the spatial layout of neuronal sensitive zones with edge orientation sensitivity.

Main Results:

  • Individual first-order tactile neurons can signal geometric features like edge orientation.
  • Both response intensity and temporal structure of neuronal activity encode edge orientation.
  • The spatial distribution of highly sensitive zones within a neuron's receptive field predicts its sensitivity to specific edge orientations.

Conclusions:

  • Peripheral tactile neurons perform feature extraction, a function previously attributed to the cerebral cortex.
  • This peripheral processing allows for efficient encoding of object geometry in the tactile system.
  • Findings suggest a parallel between tactile and visual processing in early feature extraction.