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Related Concept Videos

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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 somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Related Experiment Video

Updated: Dec 6, 2025

Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
04:40

Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS

Published on: July 30, 2020

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Fingers hold spatial information that toes do not.

Kelda Manser-Smith1, Daniele Romano1,2,3, Luigi Tamè1,4

  • 1Department of Psychological Sciences, Birkbeck, University of London, London, UK.

Quarterly Journal of Experimental Psychology (2006)
|October 5, 2020
PubMed
Summary
This summary is machine-generated.

Fingers show preferential spatial associations, improving tactile localization. Toes, however, do not exhibit similar spatial information, suggesting this is a hand-specific trait, not a general limb characteristic.

Keywords:
Body representationfingersposturetoestouch

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Last Updated: Dec 6, 2025

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Area of Science:

  • Neuroscience
  • Human motor control
  • Somatosensation

Background:

  • Fingers exhibit preferential associations with relative spatial locations, impacting tactile localization speed.
  • It remains uncertain if these spatial associations are unique to hands or a general limb characteristic.

Purpose of the Study:

  • To investigate whether toes possess similar spatial associations as fingers.
  • To determine if observed spatial associations are specific to hand usage or a broader limb property.

Main Methods:

  • Measured reaction time (RT) and error rates in response to tactile stimuli on fingers and toes.
  • Varied the relative spatial positions (upper/lower) of the digits (middle finger/toe, thumb/big toe).

Main Results:

  • Replicated preferential spatial associations for fingers, showing faster RT and lower error rates when digits were in specific relative locations.
  • Demonstrated that toes do not exhibit the same spatial associations as fingers.
  • Found that spatial information for fingers is more robust than for toes.

Conclusions:

  • Spatial associations facilitating tactile localization are a characteristic of fingers, not a general property of limbs.
  • The findings suggest these associations are linked to the specific functional roles and usage patterns of hands.