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Influence of age and hearing loss on the latency shifts of the auditory brainstem response as a result of increased stimulus rate.

Latency shifts of auditory brainstem response waves, I, III and V were studied as a function of increasing the stimulus repetition rate from 9 to 21, 42 and 63/s. There appears to be an accumulative retardation of the successive waves when faster click rates are administered that yield a prolongation of the interpeak intervals I-III and III-V. The effect on wave V and on the interpeak interval III-V seems to intensify with age (especially over 55 years). In ears with a flat sensorineural hearing loss, the adaptation of waves III and V is found to be somewhat smaller than in normal ears at the same intensity in dB SPL.