Inclusion Criteria:  Clinical diagnosis of Parkinson's by a movement disorder specialist according to United Kingdom (UK) brain bank criteria Hoehn & Yahr (H&Y) stage I-III Aged >50 years Able to walk and stand unaided Adequate hearing (as evaluated by the whisper test; stand 2m behind subject and whisper a 2 syllable word, subject repeats word) and vision capabilities (as measured using a Snellen chart - 6/18-6/12). Stable medication for the past 1 month and anticipated over a period of 6 months  Exclusion Criteria:  Psychiatric co-morbidity (e.g., major depressive disorder as determined by Geriatric Depression Scale - short form (GDS-15); <10 [26]) Clinical diagnosis of dementia or other severe cognitive impairment (Montreal cognitive assessment <21 [27]) History of stroke, traumatic brain injury or other neurological disorders (other than PD, for the PD group) Acute lower back or lower extremity pain, peripheral neuropathy, rheumatic and orthopaedic diseases Unstable medical condition including cardio-vascular instability in the past 6 months Unable to comply with the testing protocol or currently participating in another interfering research project Interfering therapy