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To the Editor:
I read with interest the paper of Ghabra et al.1 Using the Grooved Pegboard Test, the authors reevaluated the effect of simultaneous subthreshold 5-Hz repetitive transcranial magnetic stimulation (rTMS) over the primary motor hand area (M1) on fine hand movement in PD. In contrast to a previous study,2 Ghabra et al.1 found no improvement of motor performance during simultaneous 5-Hz rTMS over the contralateral M1 applied at an intensity just below active motor threshold. The data of Ghabra et al.1 confirm our previous study, which demonstrated no beneficial effects of simultaneous subthreshold 5-Hz rTMS on handwriting in unmedicated PD patients.3
Ghabra et al.1 investigated the immediate effects of subthreshold rTMS on concurrent fine manual movements to define the potential therapeutic role of rTMS in PD. However, the authors provide …
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