A measure of local variation of inter-spike intervals

It has been revealed in our recent study that cortical neurons are categorized into distinct types, according to a new measure of the local variation of inter-spike intervals, LV. In this paper, we obtain values of the local variation LV and a conventional coefficient of variation CV for a variety of model point processes. While the value of CV undergoes large changes by rate fluctuation of the point processes, the value of LV does not undergo large changes by rate fluctuation, and is principally determined by the form of intrinsic interval distribution of the original model point process.