disorders, but the neural correlates of this increased variability remain uncertain. We
hypothesized that both faster mean reaction time (RT) and less intra-individual RT variability
would be associated with larger corpus callosum (CC) size in older adults, and that these
associations would be stronger in adults with mild cognitive disorders. A normative sample
(n= 432) and a sample with mild cognitive disorders (n= 57) were compared on CC area, RT …