1. The repetitive stimulation were given on either the right or left optic lobe of Bufo vulgaris and then the reflexive discharge of the 9th ventral root, evoked by stimuli to the corresponding dorsal root, was recorded with cathod ray oscilloscope.
2. The repetitive stimuli on the optic lobe caused markedly to increase ipsilateral spinal reflex. Those effects decreased in the course of time and was reduced to normal level after ca. 1 minute.
3. When the frequency of stimulus was increased, the spinal reflex was remarkably accelerated. But in higher frequency than 100 c, p. s., it's effect reduced.
4. In the range of lower frequency for example 1 c. p. s., the spinal reflex was inhibited.
5. The repetitive stimuli of the optic lobe caused to accelerate contralateral spinal reflex, but exceedingly weak compared to that of ipsilateral.
6. The effect of the repetitive stimuli of lower frequency was inhibitory on the contralateral spinal reflex.
7. In many cases, at first acceleration and then inhibition were appeared in both ipsilateral and contralateral spinal reflex, when condition stimuli were given on one side of the optic lobe.
8. Influence of the various frequency of stimuli applied on the optic lobe was examined. In the range of lower frequency, weak inhibition was found following initial slight accelaration, but in the range of higher frequency, initial acceleration was strengthened and the later inhibition was often disappeared.
9. Conditioning stimuli of 0.5 c. p. s, had no effect on the spinal reflex.
10. Always, stronger stimuli caused stronger effects on the spinal reflex.
11. When the strength of the conditioning stimuli was kept constant, the most effective influence was observed in the case of 10 c. p. s. In upper or lower frequency than 10 c. p. s., the influence of the conditioning stimuli became weaker.
12. Without dorsal root stimulation the spike discharge of the ventral root was elicited, when relatively stronger stimulus was applied on the optic lobe.
13. When the stimulation on the optic lobe was repeated, in lower frequency spike potentials of the ventral root were gradually intensified. In higher frequency, spike potentials appeared in full strength from the begining of the repetitive stimulation.
14. After stopping the repetitive stimuli, after-discharges were found in the ventral root for few minute. The spike potentials of after-discharge were smaller than that evoked by direct stimulation of the optic lobe.
15. To evoke the ventral discharge by the repetitive stimulations to the optic lobe, the most effective frequency was 20 c. p. s. and in higher or lower frequency than this, the respons became smaller.
抄録全体を表示