... this study This work was supported by a grant from the Marian Chace Foundation to Madeleine Hackney and a grant from the American Parkinson Disease Association to Gammon Earhart References Argue, ... to the task: Interference effects of functional tasks on walking in Parkinson s disease and the roles of cognition, depression, fatigue, and balance Archives of Physical Medicine and Rehabilitation, ... suggested that the basal ganglia, the area of neurological degeneration in those with PD, are specifically involved in the control of dance movements Increased activity in the basal ganglia was observed...