Abstract
The detection of intentions and evoking movement test by transcranial magnetic stimulation (TMS) are critical technologies in various fields, such as Brain Computer Interface, Neurorehabilitation, and so on. We attempted to detect intentions appearing in a frontal robe in the brain, which most of the brain information signals go through and to analyze signals of the brain functions when movements are evoked by TMS. As the first step, the influences of finger movements on fNIRS signals in the frontal robe were qualitatively analyzed and increase of cerebral blood flow was observed considered to be evoked by the finger movements, though they were not completely one to one correspondence. In addition, when similar finger movement was evoked by TMS to primary motor cortex every 40 s, Oxy hemoglobin cumulatively increased at frontal robe, though the frontal robe was not directly stimulated. These results suggest that cerebral activity evoked by TMS is wide spreading and highly active, comparing to the activity evoked by voluntary movements, and they are not simply same state of the brain. Though it is still preliminary stage, we indicated that movement-related-signals were possibly included in the fNIRS signals recorded from frontal robe, which did not correspond to the motor cortex. In addition, we are going to refer to the functional signal accompanying with movements of the lower limbs evoked by TMS.
