Researchers were interested in what is known as ‘gait’ - a combination of physical movement, balance and co-ordination we employ when walking. When the participants walked while listening to a regular rhythm through headphones or other sound and visual cues that provide a continuous sequence or rhythm, their stride became more regular and aligned to the beat.
Parkinson’s is caused due to lack of Dopamine in the brain which is required to maintain the balance of most motor movements including gait, lack of Dopamine interrupts the balance that makes the decision process difficult in the brain, to distinguish between signals and perform the required action takes long hence they struggle with multi tasking or doing things voluntarily. Same principle applies in gait problems, when the brain is given signal to take a step forward it is confused with other signals and the person freezes. In simpler words, a continuous vibration or beat can reduce the noise in the brain and increase the signal noise of action that needs to be performed making the selection/concentration easier. In this case distort all other signals/noises in the brain and start to walk. In medical terms, continuous vibration/beat (stimulator) increase the noise in the ‘cerebello-thalamo-cortical-loop (the natural oscillatory pattern) and improves the signals of direct pathway of cortical loop in the Basal Ganglia that results to better action selection.