Probing the interaction of the ipsilateral posterior parietal cortex with the premotor cortex using a novel transcranial magnetic stimulation technique

•A three-pulse, three site, transcranial magnetic stimulation technique can be used for examining a cortical network in human subjects.•Preconditioning the posterior parietal cortex reverses the motor cortex inhibition produced by stimulation of premotor cortex.•These experiments reveal a disynaptic connection from parietal to motor cortex via the premotor cortex.