Abstract
Spontaneous unitary discharges were recorded from the lateral geniculate body in anesthetized rats. Measurements were made on the number of dis-charges in successive time intervals of unit length. With the neurons in which the stationary distribution of the discharge number was found to obey the Poisson law the joint distribution of the discharge numbers of two successive time intervals was studied. The stochastic model of Smoluchowski which fits to density fluctuation of a colloidal solution was found to be applicable to interval-to-interval fluctuation of the discharge number.
