<qa>  What is the effect of repetitive transcranial magnetic stimulation?A promising technique is repetitive transcranial magnetic stimulation rTMS that, so far, has produced some effects on motor function on other movement disorders like Parkinsons disease PD. We hypothesize that rTMS will have a beneficial effect on motor function in chronic stroke patients. Specifically, we propose to look at the effect of 20 and 25 Hz stimulation since these types of stimulation have been shown to increase the excitability of the cerebral cortex. 