B - 42 Evaluating the MMPI-3 Somatic/Cognitive Scales in Service Members and Veterans with Mild Traumatic Brain Injury (mTBI)

Abstract Objective Research on the Minnesota Multiphasic Personality Inventory, 3 (MMPI-3) Somatic/Cognitive scales is limited, but primarily focused on their relationships with symptom and performance validity tests. This study expands prior literature by providing extensive Somatic/Cognitive Scale correlates with symptom validity tests and neurocognitive measures in a sample of active-duty personnel and veterans. Method The study included Active-duty Service Members (n = 22) and Veterans (n = 31). Various measures of cognitive abilities and symptom validity were examined as a function of the Cognitive Complaints (COG) scale. Results Moderate to large differences were observed between COG groups across all MMPI-3 overreporting scales and all somatic/cognitive scales, save the NUC scale (g = 0.66–1.31 [excluding NUC]). Groups differed on three Memory Complaints Inventory memory scales: General (g = 0.89), Visuo-spatial (g = 0.62), and Verbal (g = 0.97). No significant differences were observed across cognitive tests (e.g., WAIS, CVLT). COG was moderately associated with all MMPI-3 overreporting and most somatic/cognitive scales (r = 0.30–0.72). Small to moderate correlations were observed between COG and most external validity and neurocognitive measures (r = 0.05–0.60). Conclusions Results suggest the COG scale primarily captures subjective distress rather than objective neurocognitive performance, consistent with prior work (Gervais et al., 2009). These patterns are especially pronounced in emotional, social, and somatic symptom domains. Additionally, COG scores were associated with MMPI-3 overreporting scores, but COG had weaker associations with external neurocognitive and symptom validity measures. These results suggest that COG has weak convergent validity with other self-report measures of cognition (e.g., Neurobehavioral Symptom Inventory).