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Premorbid intelligence and brain injury.

Paul Graham Morris1, J T Lindsay Wilson, Laurence T Dunn

  • 1Section of Clinical and Health Psychology, University of Edinburgh, UK. p.g.morris@ed.ac.uk

The British Journal of Clinical Psychology
|July 12, 2005
PubMed
Summary

Performance on cognitive tests like the National Adult Reading Test (NART) and Cambridge Contextual Reading Test (CCRT) is impacted by traumatic brain injury severity. These tests may overestimate premorbid abilities in head-injured individuals.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neuropsychology

Background:

  • Assessing premorbid cognitive ability is crucial for understanding the impact of brain injury.
  • Standardized tests are often used to estimate premorbid intelligence, but their validity in brain-injured populations requires examination.

Purpose of the Study:

  • To investigate the association between scores on the National Adult Reading Test (NART) and traumatic brain injury (TBI) severity.
  • To compare the Cambridge Contextual Reading Test (CCRT) performance with injury severity in individuals with head injuries.

Main Methods:

  • Fifty-five survivors of traumatic head injury were assessed using the NART and CCRT.
  • Scores from these premorbid measures were compared with initial neurosurgical admission indices of injury severity, including the Glasgow Coma Scale (GCS).

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Main Results:

  • NART scores showed a significant correlation with the Glasgow Coma Scale (GCS), indicating poorer performance with greater injury severity.
  • Individuals experiencing coma post-injury were significantly more likely to exhibit poorer NART performance.
  • The CCRT was preferred by patients and also significantly associated with GCS scores and the presence of coma.

Conclusions:

  • Both NART and CCRT performance appear to be affected by the severity of brain injury.
  • These tests may potentially underestimate the true premorbid cognitive abilities of individuals with TBI.
  • Caution is advised when interpreting scores from these measures in head-injured populations; demographic predictions may offer supplementary insights.