抄録
Materials were exclusively cats. Recording the spike potentials accompanied by the efferent zmpuls evoked in the ventral root of sacral part of the spinal cord by repetitive stimulations of the upper part of the spinal cord or of the dorsal root of the same segment, effects of the frequency of the stimulation were pursued.
Repetition of stimuli of the spinal cord caused always to decrease the strength of the spike potentials, and the increase of the fequency of stimulations strengthened the above mentioned tendency. But when the stimuli of low frequency were given on the dorsal root, responses were accelerated, but increase of the frequency of the stimuli caused to depress the spike potentials.
From above mentioned facts, it can be concluded that by the frequency of the stimulations on the dorsal root, inhibition and facilitation in the reflex mechanism can be separated. But by direct repetitive stimulations of the spinal cord evokes always inhibition, and there appears no acceleration.
