Writer's cramp (WC) is a focal dystonia characterized by abnormal movements and postures
during writing. Limited finger independence during writing manifests as difficulty
suppressing unwanted activations of neighbouring non task-relevant fingers. WC patients also
have difficulty in fine control of grip force. However, some previous studies indicate
positive effects of individual finger movement training in WC although these studies lacked
enhanced visual feedback of activations in 'stationary' fingers. The investigators have
recently developed the Finger Force Manipulandum which quantifies the forces applied by the
fingers in different tasks. This method is sensitive for detection and quantification of
small unwanted contractions in non-active ('stationary') fingers. Forces in 'stationary'
fingers can be displayed on-line providing enhanced feedback on independence of finger
movements. The aim of this study is to test the effectiveness of finger individuation
training using the FFM to improve symptoms in WC patients.