tokens: In a placebo - controlled , single - blinded , crossover study , we assessed the effect of " real " repetitive transcranial magnetic stimulation ( rTMS ) versus " sham " rTMS ( placebo ) on peak dose dyskinesias in patients with Parkinson's disease ( PD ). Ten patients with PD and prominent dyskinesias had rTMS ( 1 , 800 pulses ; 1 Hz rate ) delivered over the motor cortex for 4 consecutive days twice , once real stimuli and once sham stimulation were used ; evaluations were done at the baseline and 1 day after the end of each of the treatment series .