“…To minimize the adverse effects of invasive techniques, non-invasive devices that aim to reduce the symptoms of PD, especially FoG, have been developed. Different methodologies have been used for the construction of devices, such as those focused on acquiring EEG signals [ 24 , 68 , 69 , 70 ]. Moreover, using accelerometers located at different parts of the lower extremities, including the calf, hip, legs, and ankle [ 68 , 71 , 72 , 73 , 74 , 75 ], these devices can stimulate the muscle or nerve externally and help patients out of the episode of freezing.…”