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[The middle components of the auditory electric response. (1) On their variation by age (author's transl)].

The middle components of the auditory electric response were analyzed in terms of the wave form, detectability, peak latency, etc. in order to examine their variation by age. The subjects were 10 infants under 2 years of age, 10 children aged 3 to 4 years, 17 children aged 5 to 7 years and 11 adults. All of them were proved to have normal hearing. The responses were recorded during sleep in all children and most of the adults. Two thousand tone pips of 1000Hz were presented at 20, 40 and 60dB above the mean subjective thresholds of normal adults. The amplifiers were set for a band pass of 0.5 to 3000Hz. The following results were obtained. (1) Though the averaged detectability of Po increased with age, its difference between the adults group and the infant group was only about 20%. (2) Na frequently consisted of two peaks (Na1 and Na2). Na1 was dominant in infants and younger children, while Na2 became dominant in adults. The detectability of Na was close to that of Po. (3) The appearance of Pa in infants and younger children was very unstable and typical wave form of Po was rarely found in these age groups. (4) It was concluded that, at present, Po-Na is the most suitable index of the objective audiometry in infants.