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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.

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Related Experiment Video

Updated: Jun 16, 2026

Design, Fabrication, and Administration of the Hand Active Sensation Test (HASTe)
07:54

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

Published on: September 8, 2015

Haptic perception after a change in hand size.

Nicola Bruno1, Marco Bertamini

  • 1Università di Parma, Italy. nicola.bruno@unipr.it

Neuropsychologia
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

The brain rapidly adjusts its internal hand model using multisensory information, influencing haptic perception of object size. This demonstrates a flexible, integrated body representation for touch.

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Last Updated: Jun 16, 2026

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Body Representation

Background:

  • The brain integrates diverse sensory inputs for a unified perception during active exploration (haptics).
  • Internal models of the body are crucial for this integration, but their formation and maintenance are not well understood.

Purpose of the Study:

  • To investigate how the brain forms and maintains an internal model of the hand.
  • To examine the multisensory nature of this internal hand model and its effect on haptic perception.

Main Methods:

  • A multisensory illusion was employed, using fake hands of different sizes (smaller or larger) than the participant's actual hand.
  • Participants' haptic perception of object size was assessed after brief exposure to the illusion.

Main Results:

  • Exposure to the illusory fake hands led to a measurable change in the perceived size of objects explored haptically.
  • This indicates that the internal model of the hand was rapidly altered by the visual and tactile manipulation.

Conclusions:

  • The brain quickly recalibrates haptic signals based on an internal model of the hand.
  • This internal hand model is multisensory, integrating information beyond just vision or memory.