Action observation and motor imagery have no effect on balance and freezing of gait in Parkinson's disease: a randomized controlled trial.

Background: Combining action observation (AO) and motor imagery (MI) training may induce greater brain activity in areas usually involved in Parkinson's disease (PD) and lead to greater behavioral and neurophysiological effects than when used separately.

Aim: To determine the effects of combining AO, MI, and gait training on balance and freezing of gait in individuals with PD.

Design: This is a single-blinded, randomized controlled clinical trial.