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Related Experiment Videos

Concussion does not impact intraindividual response time variability.

Jacob J Sosnoff1, Steven P Broglio, Charles H Hillman

  • 1Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. jsosnoff@uiuc.edu

Neuropsychology
|November 7, 2007
PubMed
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Concussion increases response time variability, but this is linked to slower processing speed, not unique cognitive dysfunction. This finding differentiates transient brain injuries from chronic conditions.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Sports Medicine

Background:

  • Concussion, a transient traumatic brain injury, can impact cognitive functions.
  • Intraindividual variability in cognitive tasks is a potential indicator of neurological dysfunction.
  • Previous research has explored processing speed deficits after concussion.

Purpose of the Study:

  • To investigate the effect of concussion on intraindividual variability in processing speed tasks.
  • To determine if increased response time variability is a unique marker of cognitive dysfunction post-concussion.
  • To differentiate the neurobiological consequences of transient versus chronic brain conditions.

Main Methods:

  • Forty-four participants (22 concussed, 22 healthy) completed the Headminder Concussion Resolution Index twice.

Related Experiment Videos

  • The assessment included simple reaction time, cued reaction time (CuRT), visual recognition, and symbol scanning tasks.
  • Response time, standard deviation, and accuracy were analyzed, comparing concussed individuals to controls.

    • Main Results:

    • Concussed individuals exhibited increased response times and reduced accuracy in the CuRT task.
    • Elevated response time variability was observed in concussed individuals across all tasks.
    • When controlling for mean response time, group differences in variability were eliminated.

    Conclusions:

    • Increases in response time variability post-concussion are proportional to increases in processing time.
    • Response time variability is not a unique identifier of cognitive dysfunction following concussion.
    • Transient brain injuries like concussion have distinct neurobiological effects compared to chronic conditions.