Non-Motor Features of Cervical Dystonia (CD)

The family members and healthy volunteers will undergo elements of the neurological examination during which the movement disorders neurologist will look specifically for the presence of cervical dystonia and other sensory abnormalities. If the subject is found to have cervical dystonia or any other sensory abnormalities, the subject will be excluded from the study.

All subjects will be assessed for four non-motor symptoms, including (1) spatial discrimination threshold, (2) temporal discrimination threshold, (3) vibration-induced illusion of movement, and (4) kinesthesia.