His work currently investigates aging-related declines in motor control and its implications to stroke rehabilitation. Dr. McGregor has received a notice-of-intent to fund a VA Merit Award studying the effects of aging and exercise on GABA function with respect to motor learning. His current projects employ multimodal imaging and neurophysiological techniques (TMS, tDCS, fMRI and DTI) to investigate brain function. Dr. McGregor's work has shown that aging is associated with decreased levels of cortical inhibition, which affects motor control including motor learning.