Within-subject Stability of Latencies of Event-related Potentials-in The Awake Stage and The Stage 1.

概要

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This study attempted to investigate within-subject stability of latency of event-related potentials (ERPs) from the stage W to the stage 1. We performed an auditory discrimination paradigm repeatedly more than three times for nine normal adults. During the experiments, the EEG was recorded simultaneously. The latencies of the N1, P2, N2 and P3 components in the averaged wave forms were measured. And we studied the stability of the latencies in the subjects in the stage W and the influence of drowsy (early stage 1) or very light sleep (late stage 1) on the variability of the latencies. As a result, (1) coefficient of variance (CV) of the latencies showed the significant difference between subjects even in the stage W, (2) Between-subject variability of CV of the latencies was more statistically eminent in the subjects in the stage 1 than those in the stage W, (3) in the stage of drowsy, instability of alpha wave during the experiment and synchronization of alpha wave after the target stimuli were considered to influence the averaged wave forms, (4) in the stage of very light sleep, the "sleep and wake" pattern which was triggered by the target stimuli was repeated, and this pattern was thought to be different from the process of attention in the awake stage in the brain.
日本聴覚医学会の論文