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Related Experiment Videos

Lower precombat intelligence is a risk factor for posttraumatic stress disorder

M L Macklin1, L J Metzger, B T Litz

  • 1Psychiatry Service, Veterans Affairs Medical Center, Manchester, New Hampshire, USA.

Journal of Consulting and Clinical Psychology
|May 16, 1998
PubMed
Summary

Lower precombat intelligence may increase the risk of developing posttraumatic stress disorder (PTSD). PTSD symptoms were not associated with lower current intelligence after accounting for precombat scores.

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Area of Science:

  • Psychology
  • Neuroscience
  • Military Medicine

Background:

  • Posttraumatic stress disorder (PTSD) is a debilitating condition affecting combat veterans.
  • The relationship between cognitive abilities and PTSD risk remains an area of investigation.

Purpose of the Study:

  • To investigate the association between precombat and current intelligence and the development of PTSD symptoms in Vietnam combat veterans.

Main Methods:

  • Utilized military aptitude test results and current intelligence testing in 59 PTSD and 31 non-PTSD Vietnam veterans.
  • Assessed PTSD symptoms using the Clinician-Administered PTSD Scale.
  • Controlled for the extent of combat exposure in analyses.

Main Results:

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  • Lower precombat intelligence was significantly associated with a higher likelihood of developing PTSD symptoms, even after adjusting for combat exposure.
  • The association between current intelligence and PTSD symptoms was not significant when precombat intelligence was considered.

    • Conclusions:

    • Pretrauma intelligence levels appear to be a risk factor for developing PTSD, rather than PTSD negatively impacting intelligence test performance.
    • Cognitive factors prior to trauma exposure may influence vulnerability to PTSD.