Forward masking effects on early auditory evoked potentials

In early auditory evoked potentials (EAEPs) evoked by click trains, every click had a masking effect on the responses to the clicks following it and the whole response evoked by the click train was the sum of the masked responses to every click in the train. Special attention was paid to the situation when the inter-stimulus interval (ISI) was less than 10 ms and the responses to the individual clicks might be merged to form a continuous wave. The experiments showed that the more the number of the clicks preceding a given click in the train, the stronger the effect on the response to this click until the number was big enough and the effect became saturated; the shorter the ISI when it was less than 10 ms, the stronger the effect; the higher the intensity of the masker, the stronger the effect.