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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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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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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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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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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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Updated: Mar 2, 2026

Design, Fabrication, and Administration of the Hand Active Sensation Test HASTe
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Design, Fabrication, and Administration of the Hand Active Sensation Test HASTe

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The visual and haptic contributions to hand perception.

Lara A Coelho1, Claudia Lr Gonzalez2

  • 1The Brain in Action Laboratory, Department of Kinesiology and Physical Education, University of Lethbridge, Lethbridge, AB, T1K 3M4, Canada. lara.coelho@uleth.ca.

Psychological Research
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Summary
This summary is machine-generated.

Sensory input influences hand perception. Haptics-only feedback resulted in the most accurate hand maps, suggesting vision may interfere with somatosensory processing of the hands.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sensory Perception

Background:

  • Previous studies indicate distorted hand perception, specifically overestimating width and underestimating length.
  • Understanding the contribution of different sensory modalities to body perception is crucial.

Purpose of the Study:

  • To investigate the influence of vision and haptics on the accuracy of hand perception.
  • To determine which sensory modality provides the most accurate representation of the hand.

Main Methods:

  • Participants were assigned to Vision+Haptics, Vision-only, or Haptics-only groups to estimate hand landmarks.
  • Hand maps were created using 3D motion capture technology.
  • The Haptics-only group performed the task blindfolded, while the Vision-only group imagined their hand's position.

Main Results:

  • The Haptics-only group demonstrated the highest accuracy in constructing hand maps.
  • Vision+Haptics and Vision-only groups showed less accurate hand representations compared to Haptics-only.

Conclusions:

  • Haptic feedback alone leads to more accurate hand perception than conditions involving vision.
  • Vision may potentially interfere with accurate somatosensory processing of the hand.