Reply. reappraisal of cortical myoclonus. electrophysiology is the gold standard

We would like to thank Dr Hallett for his attention to ourletter about the electrophysiological diagnosis of corticalmyoclonus.1As he points out, our aim was to “appraisehow often current standard clinical neurophysiological test-ing reveals a cortical origin” for the myoclonus in cases inwhich cortical involvement is suspected and in which the eti-ology is known to have cortical involvement as part of thesyndrome. We found that we could only apply adequateelectrophysiological testing in about half of the patients. Ourresults are similar with those obtained more recently by Zuttand colleagues.2In patients with presumed cortical myoclo-nus (including those in w