Rostral LC diffusivity and memory performance. The top row contains correlations between RAVLT delayed recall and MD (A), RD (B), and AD (C) in the older adult group. The bottom row contains correlations between RAVLT delayed recall and MD (D), RD (E), and AD (F) in rostral LC subregion of the younger adult group. Significant correlations are seen between rostral LC diffusivity measures and RAVLT delayed recall score in the older adult group but not in the younger adult group. RAVLT, Rey Auditory Verbal Learning Test.