B - 91 Characterizing Memory Profiles of Movement Disorders: the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) Recognition Subtests

Abstract Objective This study explores the utility of novel recognition memory composites integrating recently developed recognition subtests from the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS; Duff et al., 2021) in characterizing memory profiles across Mild Cognitive Impairment (MCI) and Normal Cognitive Study (NCS) groups in patients with movement disorders. Methods Twenty patients with movement disorders (M = 69.4 years, SD = 6.3) were administered the RBANS including additional Story and Figure Recognition subtests as part of a comprehensive neuropsychological evaluation at an academic medical center. Samples were stratified by MCI (n = 15) and NCS (n = 5) groups based on clinician diagnoses. Z-score based composites were created for individual recognition measures (total, hits, false positives, and discriminability indices, d’) and “Total Delayed Recall” memory composites across list, story, and figure subtests. Results Mann–Whitney U test analyses revealed significant differences between MCI and NCS groups on Story recognition d’ performance, U = 9.50, p = <0.05. Within the MCI group, a paired samples t-test revealed significantly worse performance on recognition d’ compared to “Total Delayed Recall” (M = 1.63, SD = 2.22); t(14) = 2.84, p = <0.05. Conclusions Greater impairment in recognition discriminability compared to delayed recall suggests the involvement of memory processes that extend beyond retrieval deficits typically observed in movement disorders characterized by subcortical/frontosubcortical profiles. Further investigations are warranted in establishing implications of recognition memory composites in differentiating among MCI subtypes and neurodegenerative disease progression within movement disorder populations, as findings may have been influenced by unequal variances between groups.