The general term dystonia is used to describe a syndrome characterised by involuntary sustained muscle contractions, frequently causing twisting and repetitive movements, or abnormal postures [1, 2]. If these symptoms are restricted to one body part, the syndrome is termed "focal dystonia". In task specific focal dystonia the most prominent characteristic is the degradation and loss of voluntary control of highly overlearned complex and skilled movement patterns in a specific sensory-motor task.