The spontaneous electrical activities in the frog olfactory bulb were composed of at least two components. Monopolar recording with Ag-AgCI electrodes in or on the bulb indicated the presence of low amplitude background potentials and the very regular synchronized waves. The latter, called the intrinsic waxed waves, graded in amplitude up to 200 μV and had synchronized 6c/s waves.
The intrinsic waxed waves were induced by the odorous stimulation of the olfactory mucosa or the electrical stimulation of the olfactory nerve but not induced by the oxygen supply which was accompanying respiration.
The simultaneous recordings of the spontaneous electrical activity and the evoked potential of the bulb indicated that the amplitudes of the intrinsic waves and the evoked potentials decreased or increased by the action of drugs, such as pentobarbital, nicotine and tubocurarine. This fact showed that the origin of these two waves might be similar.
The results of microelectrode explorations showed that the focus of maximum amplitude localized at the same depth as that of olfactory cell groups. It would be suggested that the spontaneous electrical activities (background and intrinsic waxed waves) and the evoked potentials of the bulb arose primarily from the same origin, namely from the olfactory cell layer.
The possible role of the olfactory bulb-electrogram in shifting dipole theory between the soma and the dendrite, instead of soma or dendrite theory was discussed.
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