Postural instability and resultant falls are very common in patients with Parkinson’s disease (PD). However, the pathophysiology underlying postural instability in PD is insufficiently understood. The aim of this project is to develop and validate the use of an MRI compatible balance simulator to study the areas in the brain involved in balance control. More specifically, we are interested in the differences in activation of and communication between the brain areas involved in balance control between healthy older adults and patients with PD.