[The ERA characteristics in normal-hearing persons].
The ERA characteristics (amplitudes and latencies) were measured in normal-hearing adults (20 to 25 years of age) at frequencies of 500 Hz, 1000 Hz and 4 000 Hz. Two other age groups (30 to 50 and 55 to 70 years of age) were measured only at 1 000 Hz. Contrary to other authors, the linear scale was chosen to represent the amplitudes. In calculating the variances of the amplitudes it turned out that the intra-individual variance is significantly below the inter-individual variance. Expressed in per cent as a variational coefficient, both decrease with increasing stimulus intensity. Contrary to the behaviour of the amplitudes, no significant difference between the intra- and inter-individual variational coefficient of the latencies could be found. The same is valid for the variational coefficients of the N1 and P2 latencies. As a function of the stimulus strength, the variational coefficient passes through a minimum at medium stimulus intensity. Within the investigated range of 20 to 70 years of age, no significant differences of amplitudes and latencies between the age groups could be found.
D000161:Acoustic Stimulation; D000328:Adult; D000367:Age Factors; D000368:Aged; D001299:Audiometry; D001309:Auditory Threshold / Q000502:physiology*; D006801:Humans; D008875:Middle Aged
ERA-Kennlinien bei normalhörenden Personen