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Related Experiment Videos

Information processing difficulty long after self-reported concussion.

Daniel M Bernstein1

  • 1Simon Fraser University, Burnaby, BC, Canada. db6@u.washington.edu

Journal of the International Neuropsychological Society : JINS
|August 8, 2002
PubMed
Summary
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Mild head injury (MHI) may cause long-lasting cognitive deficits, challenging assumptions of full recovery. Event-related potentials and cognitive tests reveal subtle, persistent issues years after concussion.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neuropsychology

Background:

  • Mild head injury (MHI) is often presumed to result in swift and complete cognitive recovery.
  • Previous research suggests subtle cognitive impairments may persist long after MHI.

Purpose of the Study:

  • To replicate and extend previous findings on long-term cognitive effects of MHI.
  • To investigate persistent differences in cognitive function and electrophysiological measures between individuals with a history of MHI and controls.

Main Methods:

  • Matched groups of individuals with self-reported MHI (n=13) and controls (n=10) were compared.
  • Cognitive performance was assessed using the Digit Symbol substitution task and a dual-task paradigm.
  • Event-related potentials (P300 amplitude) were measured during auditory discrimination tasks.

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Main Results:

  • Controls outperformed the MHI group on the Digit Symbol task and the dual task.
  • Controls demonstrated larger P300 amplitudes on both easy and difficult auditory discrimination tasks.
  • A combination of electrophysiological, neuropsychological, and self-report measures predicted group membership with 88% accuracy.

Conclusions:

  • Findings suggest that MHI may be associated with long-lasting, subtle cognitive problems.
  • The combination of event-related potentials and demanding behavioral measures may be effective in detecting these persistent deficits.
  • These results challenge the notion of complete cognitive recovery after mild head injury.