抄録
1. Facilitation and inhibition were subjected to experimental examinations, by employing models. for synapse constructed with Lillie's nerve models variously combined or modified.
2. Facilitation easily occurred as a restilt of interaction between two models without any direct connection, but inhibition never occurred in our investigations.
3. Facilitation and inhibition due to temporary increase and decrease of number of “pre-cellular” active elements (dendrites) were clear and definite. on this experience, a new hypothesis of facilitation and inhibition was proposed, which explains satisfactorily the temporal courses of facilitation and inhibition revealed by Lloyd (11).
4. If granted that the β-deflection and γ-deflection (or soma-potential) discovered by Renshaw (14) are due to the activations of dendrites and axon-hillock (or axon itself) respectively, then our hypothesis helps us to understand the changes in size of β-and γ-deflections in inverse directions when examined by lengthening the intervals between the conditioning and test impulses. Facilitation and inhibition of antidromic impulses are also explainable.
5. The positive cord potential in association with inhibition was regarded as due partly to the anelectrotonic regions which will be produced in every resting neurone or fibre neighbouring an excited, and partly to the positive after-potential of β, which is supposed to be representing the dendrite activation.
6. Based on a result obtained during the course of the experiments, axocellular inhibitory coil aterals connecting neighbouring neurones were postulated. This explains the inhibitory action of an antidromic impulse on adjacent axons discovered by Renshaw (17), and also presents itself as a significant mechanism for adjustment of movement.
7. The hypothesis of Eccles and Gesell, particularly the former, were criticized, and a few points of disagreement were presented.
