title: Detectability of the acoustically evoked composite response (40 HZ potential) near threshold.
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 cut-off 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.
mesh_terms: D000161:Acoustic Stimulation; D001300:Audiometry, Evoked Response; D001309:Auditory Threshold / Q000502:physiology; D001933:Brain Stem / Q000503:physiopathology; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D011930:Reaction Time / Q000502:physiology