[Studies on transcranial magnetic stimulation--Part 2. Pathological findings of rabbit brain after long-term stimulation based on characteristics of intracerebral induced voltage].

I investigated the safety of transcranial magnetic stimulation (TMS) with a double coil. Induced voltages of a double coil compared in rabbit brain with those in the atmosphere were almost equal. When the distance from the coil's surface was disregarded, the maximum induced voltage spot did not move.

The origin of pattern reversal short latency visual evoked potential as determined by dynamic topography and the dipole tracing method.

The generator sites of the parietal P59 and occipital N26 components elicited by hemi-field pattern reversal stimuli were investigated. The topographic distribution of the occipital N26 component showed a paradoxical lateralization, whereas that of the parietal P59 component exhibited an anatomical lateralization. The equivalent dipoles of both occipital N26 and parietal P59 components were situated on the deep mesial surface of the functioning occipital lobe.

[Studies on transcranial magnetic stimulation--characteristics of the magnetic coil].

I measured the characteristics of several different magnetic coils. In a round coil and a doughnut-shaped coil, induced voltages measured by a longitudinal probe and compound muscle action potentials (CMAPs) recorded from the abductor pollicis brevis showed two peak voltages in the former at a point halfway between the coil center and the outer edge, and in the center of the windings in the latter. On the other hand, in a double coil, the maximum induced voltage showed a peak at the center of the coil, and when the coil current was antidromically charged against the median nerve, the distribution of CMAPs was more focal.