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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.
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
Prosopagnosia01:24

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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...
Major Somatic Sensory Pathways01:28

Major Somatic Sensory Pathways

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 posterior columns...
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...

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Related Experiment Video

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Visualization Method for Proprioceptive Drift on a 2D Plane Using Support Vector Machine
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Published on: October 27, 2016

Losing one's hand: visual-proprioceptive conflict affects touch perception.

Alessia Folegatti1, Frédérique de Vignemont, Francesco Pavani

  • 1UMR-S 864 Espace et Action, INSERM, Bron, France. Alessia.Folegatti@inserm.fr

Plos One
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Summary

The rubber hand illusion (RHI) causes somatosensory changes due to visual-proprioceptive conflict, not necessarily a sense of disownership. This finding clarifies the RHI

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The Crossmodal Congruency Task as a Means to Obtain an Objective Behavioral Measure in the Rubber Hand Illusion Paradigm
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Published on: July 26, 2013

Area of Science:

  • Neuroscience
  • Psychology
  • Somatosensory research

Background:

  • The rubber hand illusion (RHI) is widely studied, but the sense of disownership is less understood.
  • RHI may induce somatosensory changes in the real hand, suggesting disownership.
  • This study investigates whether these changes stem from disownership or visuo-proprioceptive conflict.

Purpose of the Study:

  • To differentiate between somatosensory changes due to hand disownership and those caused by visuo-proprioceptive conflict during the RHI.
  • To propose a theoretical framework for understanding altered somatosensation in the RHI.

Main Methods:

  • Experiment 1: Established the RHI and measured reaction times (RTs) to tactile stimuli on the participant's hand.
  • Experiment 2: Induced visuo-proprioceptive misalignment using prismatic displacement, without RHI, and measured tactile RTs.
  • Both experiments assessed proprioceptive drift.

Main Results:

  • RHI and prismatic displacement similarly slowed reaction times to tactile stimuli.
  • Both manipulations led to proprioceptive drift.
  • Tactile processing alterations occurred in both conditions.

Conclusions:

  • Somatosensory alterations during RHI are caused by cross-modal mismatch between seen and felt hand positions.
  • These changes are not definitive evidence of hand disownership.
  • The findings clarify the mechanisms underlying somatosensory changes in the RHI.