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Failure of a single performance validity test matters after traumatic brain injury
Jacobus Donders1, Ferdinand Korneli1, Leigha Slater1
1Department of Psychology, https://ror.org/01t6fdj11Mary Free Bed Rehabilitation Hospital, Grand Rapids, MI, USA.
Objective:
This study aimed to explore the correlates of zero, one, and multiple performance validity test (PVT) failures on cognitive test performance in patients with various degrees of severity of traumatic brain injury.
Method:
306 participants completed the Trail Making Test as part of a neuropsychological evaluation within 1-36 months post-injury. They were assigned to zero, one, or ≥ two fail groups on the basis of at least two independent PVTs. Group differences in Trail Making Test performance were analyzed with analysis of variance, with post hoc contrasts with the Bonferroni correction for multiple comparisons. Groups were also compared on various background characteristics.
Results:
Participants who passed all PVTs had statistically significantly better performance on both parts of the Trail Making Test as compared to those who failed either one or multiple PVTs, with the latter two groups not differing statistically significantly from each other. PVT failure was relatively more common in participants who were female, had an uncomplicated mild TBI, were involved in financial compensation-seeking, and were seen at a longer time point since injury.
Conclusion:
Failure of even only one PVT is associated with lower neuropsychological test performance in patients with traumatic brain injury, especially when empirically validated criteria are used that are stratified by injury severity. Such failure does not always reflect malingering but must be interpreted and addressed in the context of patient background characteristics.
