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Rediscovering tactile agnosia.

R J Caselli1

  • 1Department of Neurology, Mayo Clinic Scottsdale, AZ 85259.

Mayo Clinic Proceedings
|February 1, 1991
PubMed
Summary
This summary is machine-generated.

Tactile object recognition (TOR) can be impaired by somesthetic dysfunction, but can also be affected by tactile agnosia, a disorder of recognition without basic sensory loss. This subtle impairment results from damage to specific brain regions.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Somesthetic assessment evaluates sensory and motor functions.
  • Tactile object recognition (TOR) involves identifying objects through touch.
  • Understanding TOR deficits is crucial for diagnosing neurological conditions.

Purpose of the Study:

  • To determine how sensorimotor disorders affect tactile object recognition (TOR).
  • To investigate if TOR can be impaired independently of basic somatosensory deficits.
  • To identify the neurological basis of tactile agnosia.

Main Methods:

  • Somesthetic assessment of 84 patients with nervous system damage.
  • Analysis of perceptual and motor disorders impacting TOR.
  • Distinguishing between astereognosis and tactile agnosia.

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Main Results:

  • Somesthetic dysfunction impairs TOR, with peripheral lesions causing more severe deficits than cortical ones.
  • Hemiparesis and hemianopia do not preclude normal TOR.
  • Hemineglect significantly contributes to TOR impairment.
  • Tactile agnosia, a TOR impairment without basic somatosensory loss, was identified.
  • Tactile agnosia is a subtle disorder distinct from astereognosis.
  • Tactile agnosia is linked to unilateral parietotemporal cortical damage.

Conclusions:

  • TOR can be impaired by both basic somesthetic deficits and tactile agnosia.
  • Tactile agnosia represents a specific deficit in tactile recognition.
  • Damage to parietotemporal cortices is implicated in tactile agnosia.