SCA 1, 2, 3, 6, and FA with mutations in the pathogenic range confirmed from genetic testing

SCA: aged 18-75 years

FA: aged 12-30, diagnosed between ages 5-25

community dwelling

physically/cognitively capable of consenting/assenting and complying with the protocol based on investigator's judgement

able to walk independently 10 yards without an assistive device

able to sit or stand unassisted for 30 seconds

no other neurological or musculoskeletal disorder that could affect mobility

no other history of head injury, vestibular function, stroke, or other disorders that could affect mobility

willing and able to participate in a 2-year study

consent to be video recorded while performing study assessments

Instrumented Data Exchange for Ataxia Study