Brainstem auditory evoked responses in man. I. Effect of stimulus rise–fall time and duration

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Abstract
Short latency (under 10 ms) evoked responses elicited by bursts of white noise were recorded from the scalp of human subjects. Response alterations produced by changes in the noise-burst duration (on time), interburst interval (off time) and onset and offset shapes were reported and evaluated. The latency of the most prominent response component, wave V, was markedly delayed with increases in stimulus rise time but was unaffected by changes in fall time. Increase in stimulus duration and therefore loudness resulted in a systematic increase in latency, probably due to response recovery processes, as this effect was eliminated with increases in stimulus off time. The amplitude of wave V was insensitive to changes in signal rise and fall times, while increasing signal on time produced smaller amplitude responses only for sufficiently short off times. Wave V of the human auditory brainstem-evoked response is apparently solely an onset response.

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