Patterns of Performance and Symptom Validity Test Findings After Mild Traumatic Brain Injury.

OBJECTIVE

The purpose of this study was to evaluate the presence of demographic, injury and neuropsychological correlates of distinct patterns of performance validity test and symptom validity test results in persons with mild traumatic brain injury (mTBI).

METHOD: One hundred and seventy-eight persons with mTBI completed the Test of Memory Malingering (TOMM; performance validity) and the Minnesota Multiphasic Personality Inventory-2-Restructured Form (MMPI-2-RF; symptom validity) within 1-12 months postinjury. Four groups were compared: (a) pass both TOMM and MMPI-2-RF validity criteria, (b) pass TOMM and fail MMPI-2-RF, (c) fail TOMM and pass MMPI-2-RF, and (d) fail both TOMM and MMPI-2-RF.

RESULTS

Compared to Group a, participants in combined Groups b-d were more than twice as likely to be engaged in financial compensation-seeking and about four times less likely to have neuroimaging evidence of an intracranial lesion. The average performance of Group d on an independent test of verbal learning was more than 1.5 standard deviations below that of Group a. Participants in Group b were more likely to have intracranial lesions on neuroimaging than participants in Group c.

CONCLUSION

Performance and symptom validity tests provide complementary and non-redundant information in persons with mTBI. Whereas financial compensation-seeking is associated with increased risk of failure of either PVT or SVT, or both, the presence of intracranial findings on neuroimaging is associated with decreased risk of such.