RecruitingBehavioural interventionSegwayPD: The Effect of Sensory-augmented Postural Training Using Segway on Motor and Cognitive Function in Individuals With Parkinson's DiseaseThe purpose of this study is to examine the safety and efficacy of postural training emphasized on the integration of multiple sensory information into motor control in individuals with PD. This project is a proof-of-concept study to assess the effectiveness of postural training using Segway, which serves a platform to provide augmented and continuous proprioceptive and visuospatial information during postural training.