Abstract
In 56 persons with normal hearing and 10 patients with sensorineural hearing loss, acoustically evoked potentials were recorded at stimulus repetition rates of 10/s, 20/s, 30/s and 40/s. With a sufficiently low lower amplifier cutoff frequency, one obtains at the repetition rate of 40/s a composite response described by Galambos et al. (1981) as 40 Hz potential, which consists of the ABR evoked by the given stimulus and superposed MLR-waves evoked by the preceding stimuli. In both groups the amplitude mean value of the potentials recorded at the stimulus rate 40/s was significantly higher than at lower rates. The detectability of the near-threshold response for the subjects with normal hearing was distinctly higher than the responses recorded at lower rates.