About the human visually evoked cortical potentials in response to train stimulation.

Cortical potentials were elicited by means of light pulse trains delivered at varying number and frequencies of flashes. The stimulation trains evoked distinct series of individual responses up to flash interval of 35 ms, the shape of which was influenced by the number of the flasches in the trains. A gradual decrease of the second (and some later) wave in the response was observed beginning at flash interval of 80 ms and depending on the number of the flashes in the stimulation train. The fading away of the second wave at high-rate intermittent light stimulation is discussed in respect to some previous findings at retinal and cortical levels.