The middle components of the auditory evoked response in young children were investigated during awake and asleep. The results were as follows.
(1) The wave form, latency, and appearance of the middle components depend on the test condition, that is, awake or asleep. Although the detectability of Po-peak was about the same for both of the test conditions, that of Na- and Pa- peak were lower in the sleeping state than in waking state and this difference was prominent in the Pa-peak.
(2) The later peaks, such as Nb- and Pb-peak, were scarcely detected in the childring both waking and sleep.
(3) It is surmised that the middle components may be divided into four groups comprising Po, Na, Pa and peaks later than Nb and that the each group has the different origins or pathways of the response.
(4) It was found that there was a large discrepancy between the appearance of Pa or the later peaks such as Nb and Pb of Mendel's group and that of ours. A reason of this discrepancy may be due to the difference of filter slope.
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