頻回刺激による頭頂部緩反応(SVR)

概要

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There were many reports concerning the studies of the interstimulus interval (ISI) on SVR. However, many of them were performed at the condition of the same number of stimuli. From the viewpoint clinical application, its desirable to study the influence of the ISI on SVR in the same test period. As the test period becomes longer, there are more chances to obtain artifacts due to change in sleep stage, restlessness and so on, and the number of test trial is limited under the long test period. I observed SVR with 5 kinds of ISI (0.4, 0.6, 0.8, 1, 3sec) in the same test period, and obtained the results as follows.(1) The amplitude of average responses had the tendency to increase as ISI became shoter and an ISI of 0.4sec yielded the maximum amplitude.(2) At the stimulus near threshold, the best result was obtained for ISI of 0.4sec, that is, this ISI showed the highest rate of response with reliable stability. In analizing these results, the increase in amplitude by increase in number of samples is greater than the decrease in the amplitude of a single response due to decrease in ISI. The threshold of evoked response for ISI of 0.4sec (SVR to rapidly repeated auditory stimuli) was lower than that for ISI of 3sec. Considering the results, SVR to rapidly repeated auditory stimuli is to be a practical use.
社団法人日本耳鼻咽喉科学会の論文