Abstract
Animals were anesthetized or curarized, spinal cord block was established, and additional afferent stimulation applied; recordings were made of the spontaneous electrical activity of the lumbosacral region of the cord, and it was shown that the amplitude of the potential variations was directly proportional to the rate of arrival of impulses into the area from which the recording was made, and this was specially true of the slow potentials. At the stage of light anesthesia or mild curarization spikes were generated at a steady rate; there were also slow fluctuations of potential at the respiratory rate. On the physiological conditions the spontaneous activities of the brain and spinal cord are differently affected by afferent inflow; it may therefore be suggested that though both are reflex in origin, the two activities are qualitatively different, and that different functional organizations of the two sections of the nervous system have evolved.
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