抄録
1. In the strychninized olfactory bulb of curarized rabbits, single shock stimulation of the olfactory epithelium was found to bring about a monophasic negative wave of 20-40msec. duration (N-potential) followed by a train of 30-50 cps oscillatory wave lasting 200-400msec.(R-wave). The properties of the R-wave were studied in comparison with the induced wave and the N-potential.
2. The R-wave and the induced wave readily disappeared after intravenous injection of pentobarbital sodium. The N-potential was more resistant than the R-wave or the induced wave.
3. During asphyxia, the R-wave was lost simultaneously with the induced wave.
4. The R-wave disappeared during anterior commissure stimulation and augmented in the post-stimulation period, just as did the induced wave.
5. By high frequency stimulation in the mesencephalic reticular formation, the R-wave was markedly suppressed.
6. The R-wave had a much longer recovery cycle than that of the N-potential.
7. The R-wave reversed in polarity in a deep layer of the olfactory bulb. The reversal point was slightly deeper than that of the N-potential.
8. A number of units in the olfactory bulb discharged rhythmically bearing a clear phase relationship with the R-wave. In some units, suppression of the spontaneous discharge was observed during the excursion of the R-wave.
9. From these findings, it was inferred that the R-wave had a generating mechanism in common with the induced wave. The origin of the R-wave was discussed in connection with that of the N-potential. The authors are grateful to Dr. Kitsuya IWAMA for his invaluable discussion throughout the course of this experiment. A part of the expense for this work was defrayed by a grant of the Ministry of Education.
