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Frequency of positive indicators of profile invalidity in a sample of mild traumatic brain injury (mTBI) subjects: a preliminary report.

Friday, November 08, 2013 — Poster Session III

10:00 a.m. – 12:00 p.m.

FAES Academic Center (Upper-Level Terrace)




  • K.C. Lopez
  • S. Levy
  • J. Dsurney


The validity of a neuropsychological assessment is partly dependent on a patient’s willingness to put forth full consistent effort. Variability in effort can be seen in a variety of situations, including fatigue, depression, and intentional misrepresentation of one’s ability. These misrepresentations are typically over-reporting of symptoms or intentional poor performance. Malingering is a diagnosis involving secondary gain, below chance responding on forced-choice tests, and self reported non-credible responding. The literature on response validity and mTBI show high incidences of deviant responding and potential malingering. Our sample consists of 41 mTBI subjects that have been evaluated between one and five years post injury. The subjects were assessed for response validity using two stand-alone symptom validity tests and several embedded measures of validity and response bias. The results indicated the following percent of subjects had positive findings on the following measures: MMPI-2-RF (Fr and/or FBS)- 31.2%, CVLT forced-choice-7.3%, TOMM-2.9%, MSVT-8.9%. The rate of positive findings varies greatly on measures of potential response invalidity. In our sample, symptom exaggeration appears to be the most frequent issue, whereas effort is less of a problem. These data indicate the frequency of a positive score and not that of actual invalidity, poor effort, or malingering.

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