The Utility and Comparative Incremental Validity of the MMPI-2 and Trauma Symptom Inventory Validity Scales in the Detection of Feigned PTSD

The authors examined the comparative predictive capacity of the Trauma Symptom Inventory (TSI) Atypical Response Scale (ATR) and the standard set of Minnesota Multiphasic Personality Inventory-2 (MMPI-2) fake-bad validity scales (i.e., F, F_B, F_p, FBS) to detect feigned posttraumatic stress disorder (PTSD). Remitted trauma victims (n = 60) completed the TSI and MMPI-2 under standard (honest) instructions and then were randomly assigned to 1 of 2 experimental conditions (noncoached/validity scale coached) in which they were administered these instruments again with instruction to fake PTSD. These test protocols were compared with TSI and MMPI-2 results from workplace injury claimants with PTSD (n = 84). The ATR and FBS were able to distinguish only the noncoached participants instructed to fake from the PTSD claimants; in contrast, the F, F_B, and F_p scales were able to distinguish both the noncoached and the validity-scale-coached participants from the PTSD claimants. F, F_B, and F_p always outperformed the ATR and FBS; neither the ATR nor the FBS was able to add incremental predictive variance to that of F, F_B, or F_p.