Focal Hand Dystonia (FHD)
FHD is characterised by involuntary movements, cramps and tremors in the hand and arms, is often known as 'Writer's Cramp', and can be task-specific. Traditionally a motor disorder, recent research has shown an association with impaired temporal and spatial tactile discrimination, reduced interdigit separation in S1, and under activation in S2 to stimuli4,5.
FHD can be caused by over-use of the hand, and/or repeated movements, such as those that occur during the playing of music.