 The purpose of this protocol is to investigate the effect of repetitive transcranial stimulation rTMS on the motor cortex of chronic stroke patients and motor function. Four different stimulation parameters within the limits of current safety guidelines will be used. We plan to determine; 1 which rTMS stimulation parameters induce more cortex excitability, 2 whether there is any improvement of hand motor function after rTMS, and 3 if the applied stimulation parameters are safe in chronic stroke patients. The optimal parameters will be subsequently proposed for use in an experimental protocol for rehabilitation. 