title: Differences in MMPI-2 FBS and RBS scores in brain injury, probable malingering, and conversion disorder groups: a preliminary study.
abstract: This study examined differences in raw scores on the Symptom Validity Scale and Response Bias Scale (RBS) from the Minnesota Multiphasic Personality Inventory-2 in three criterion groups: (i) valid traumatic brain injured, (ii) invalid traumatic brain injured, and (iii) psychogenic non-epileptic seizure disorders. Results indicate that a >30 raw score cutoff for the Symptom Validity Scale accurately identified 50% of the invalid traumatic brain injured group, while misclassifying none of the valid traumatic brain injured group and 6% of the psychogenic non-epileptic seizure disorder group. Using a >15 RBS raw cutoff score accurately classified 50% of the invalid traumatic brain injured group and misclassified fewer than 10% of the valid traumatic brain injured and psychogenic non-epileptic seizure disorder groups. These cutoff scores used conjunctively did not misclassify any members of the psychogenic non-epileptic seizure disorder or valid traumatic brain injured groups, while accurately classifying 44% of the invalid traumatic brain injured individuals. Findings from this preliminary study suggest that the conjunctive use of the Symptom Validity Scale and the RBS from the Minnesota Multiphasic Personality Inventory-2 may be useful in differentiating probable malingering from individuals with brain injuries and conversion disorders.
authors.affiliation: University of Florida, Gainesville, FL, USA. CalebPPeck@Yahoo.com
authors.forename: C P
authors.initials: CP
authors.lastname: Peck
authors.forename: R W
authors.initials: RW
authors.lastname: Schroeder
authors.forename: R J
authors.initials: RJ
authors.lastname: Heinrichs
authors.forename: E J
authors.initials: EJ
authors.lastname: Vondran
authors.forename: C J
authors.initials: CJ
authors.lastname: Brockman
authors.forename: B K
authors.initials: BK
authors.lastname: Webster
authors.forename: L E
authors.initials: LE
authors.lastname: Baade
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D015982:Bias; D001930:Brain Injuries / Q000523:psychology*; D003291:Conversion Disorder / Q000523:psychology*; D004185:Disability Evaluation; D004827:Epilepsy / Q000175:diagnosis / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D008306:Malingering / Q000175:diagnosis / Q000523:psychology*; D008875:Middle Aged; D010555:Personality Inventory; D011336:Probability; D015203:Reproducibility of Results