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Related Experiment Videos

Tactile functions after cerebral hemispherectomy.

H Backlund1, C Morin, A Ptito

  • 1Department of Physiology, Göteborg University, Sweden; Institute of Clinical Neuroscience, Göteborg University, Sweden. helena.backlund@physiol.gu.se

Neuropsychologia
|February 15, 2005
PubMed
Summary

Hemispherectomy patients show preserved tactile detection and intensity coding due to neuroplasticity. However, complex tactile functions like directional sensibility are impaired on the paretic side, indicating limitations in developmental plasticity.

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Area of Science:

  • Neuroscience
  • Neuroplasticity
  • Sensory Function

Background:

  • Early-life brain lesions and hemispherectomy can lead to unexpected preservation of tactile function.
  • Developmental neuroplasticity is often cited as the reason for preserved function.
  • Previous tactile assessments may have lacked the sensitivity to detect subtle deficits.

Purpose of the Study:

  • To investigate tactile detection and directional sensibility in hemispherectomized patients.
  • To compare tactile function on paretic versus nonparetic sides.
  • To explore the limits of neuroplasticity in tactile sensory processing.

Main Methods:

  • Assessed monofilament detection and three types of tactile directional sensibility.
  • Examined four hemispherectomized patients and six healthy controls bilaterally (patients) or unilaterally (controls).

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  • Included subjective intensity ratings following directional sensibility tests.

    • Main Results:

    • Tactile detection was less impaired than directional sensibility on the paretic side.
    • Tactile sensation intensity was rated higher by patients than controls on both sides.
    • Nonparetic side functions were largely within the normal range.

    Conclusions:

    • Neuroplasticity adequately supports tactile detection and intensity coding after hemispherectomy.
    • Complex tactile functions, specifically directional sensibility, are vulnerable.
    • Precise afferent information processing in distributed cortical networks is crucial for directional sensibility.