Effects of inter-stimulus intervals on the auditory evoked fields and potentials.

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We have measured magnetic fields and electrical potentials evoked on the scalp by auditory stimuli of a pure tone and a short speech sound. As the inter-stimulus interval was decreased from 1, 400 to 200ms, the amplitude of the field and potential responses decreased, where the response to the speech severely changed in waveform at short intervals. As proved by computer simulations, these changes can not be explained by simple superposition of waveforms of successive responses. We have also studied the change of the response when the subject directed selective attention to either the tone or speech given at short intervals of 200-300ms. The attention-related shift was clearly observed in the potential response in a manner that depended on the sequence of the response-evoking and its preceding stimuli, where the stimuli-sequence dependence was quite different from that previously obtained in the measurement at long stimulus intervals. Assuming the superposition of successive responses, the observed stimuli-sequence dependence was interpreted as derived from that at long stimulus intervals.
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