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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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Tactile and Chemical Senses01:27

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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.
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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:
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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.
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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Sensory Functions of the Skin01:16

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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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Related Experiment Video

Updated: Dec 23, 2025

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Online sensory feedback during active search improves tactile localization.

Xaver Fuchs1, Dirk U Wulff2, Tobias Heed1

  • 1Biopsychology and Cognitive Neuroscience, Faculty of Psychology and Sports Science, Bielefeld University.

Journal of Experimental Psychology. Human Perception and Performance
|April 24, 2020
PubMed
Summary

Closing the sensory feedback loop by touching the skin significantly improves tactile localization accuracy. This highlights the critical role of real-time tactile feedback in refining body perception and motor control.

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Area of Science:

  • Neuroscience
  • Human Perception
  • Motor Control

Background:

  • Natural motor behavior relies on sensory feedback in closed-loop systems.
  • Human tactile localization on skin exhibits systematic errors, suggesting distorted body representations.
  • Traditional experiments often interrupt the action-perception loop by limiting limb interaction.

Purpose of the Study:

  • To investigate how experimental procedures affect tactile localization and perceptual distortions.
  • To determine the impact of uninterrupted tactile feedback on localization accuracy.
  • To compare the effects of tactile versus visual feedback on matching limb positions.

Main Methods:

  • Participants received touch on the left forearm and localized it by moving the right index finger with eyes closed.
  • A barrier was used to block tactile feedback in some trials.
  • Visual feedback was provided in other conditions while reaching and searching.

Main Results:

  • Tactile search significantly reduced localization error compared to initial touchdown.
  • Localization improvement was minimal when tactile feedback was blocked by a barrier.
  • Visual feedback reduced error, but subsequent tactile search provided a slight additional improvement.

Conclusions:

  • Both tactile and visual feedback aid in matching reaching and target limb positions during localization.
  • Closed-loop tactile feedback uniquely and significantly improves tactile localization accuracy.
  • Real-time, target-specific tactile sensory information is crucial for precise tactile localization.