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Cortical sensory evoked potentials and communicative forebrain functions

L Leinonen1, M Sams, H Heiskala

  • 1Department of Physiology, University of Helsinki, Finland.

Brain & Development
|January 1, 1994
PubMed
Summary

Cortical evoked potentials (visual, auditory, somatosensory) absence in neurodevelopmental impairments correlates with lack of communication. Normal potentials indicate varied communicative skills, supporting their role in communication substrates.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Clinical Neurology

Background:

  • Neurodevelopmental impairments significantly impact social functioning and communication.
  • Cortical evoked potentials (CEPs) offer objective measures of neural pathway integrity.

Purpose of the Study:

  • To investigate the correlation between CEPs (visual, auditory, somatosensory) and communication abilities in individuals with neurodevelopmental impairments.
  • To determine if absent or abnormal CEPs indicate a loss of neural substrates for communication.

Main Methods:

  • Measured cortical evoked potentials to visual, auditory, and somatosensory stimuli in 20 subjects with neurodevelopmental impairments.
  • Correlated CEP findings with behavioral observations of social functioning and communication levels.

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Main Results:

  • Two subjects with absent CEPs showed no communicative behavior.
  • Three subjects with absent responses in one modality (but preserved in others) had varying communication levels.
  • Ten subjects with marked CEP deviations exhibited a range of communication from none to speech.
  • Five subjects with normal CEP patterns demonstrated diverse communicative skills, including speech.

Conclusions:

  • Bilateral loss of cortical evoked potentials (somatosensory, visual, auditory) is a significant indicator of lost neural substrates for communication.
  • CEPs are valuable biomarkers for assessing communication potential in severe neurodevelopmental impairments.