Focal dystonia is a neurological disorder involving involuntary spasms and cramping in muscles, such as the hands and fingers. It can result from overuse and tends to affect musicians, golfers ...

I cannot listen to myself on TV.” Spasmodic dysphonia affects up to 50,000 people in North America, and is a subset of dystonia, a muscle contraction disorder that can affect many parts of the body.

The above memory appears in my recently published book about living with an elusive neurological condition that took me more than 40 years to discover: a movement disorder called dystonia.