A high-level of motor control often requires complex processing of sensory information, which likely corresponds to the neural correlates for mental imagery of movement. Such cognitive aspects of motor control may underlie other cognitive functions, such as mental calculation. The present transcranial magnetic stimulation (TMS) study is aimed to characterize the relation between cognitive processing and motor control. Based on our previous results from neuroimaging experiments, we hypothesize that the ability to process information for motor imagery would primarily be associated with the dorsal lateral premotor context (PMd) as well as the posterior parietal cortex. TMS will be used to disrupt neural processes in the limited brain structures under the coil for a short period of time (virtual lesion study). For this proposal, 15 healthy subjects will perform number-guided motor execution/imagery tasks. Both tasks will be guided by 10 visual number stimuli presented at a rate of 1.0 Hz. For the test TMS stimuli, a paired TMS stimulation will be delivered to either M1 or PMd100 (to) 150 milliseconds after 5 of the visual number stimuli. The frequency of TMS stimulation will be 1.0 Hz on average for a short period of time (10 seconds). Measurement will be accuracy of the task performance under the TMS stimulation as compared with a sham condition. We expect that the TMS stimulation to PMd will interfere with the performance of motor imagery more than the performance of motor execution. The present study will clarify the neural correlates underlying the ability of imagining movement, which is now drawing growing attention in the neuroscience community.