404 various digits function as a unit, such as arpeggios, could eventually induce changes in the
sensory representation of the hand with blurring of the segregation of different digits. This
might be the case particularly when small repeated traumas are added, as in forceful,
‘hammer-finger’piano playing. Disorganization and consequent confusion of sensory
Figure 26.4The bold fMRI images of a normal and dystonic guitar player executing right hand arpeggios in the
scanner are displayed. Note the greater activation of the sensorimotor cortex (arrows) and the lack of activation
of premotor and supplementary motor cortices in the dystonic patient. Modified from Ref. 40. (See Plate 24 in
colour section.)