Auditory brainstem responses to chirps delivered by an insert earphone with equalized frequency response.
Recently it has been demonstrated that auditory brainstem responses, ABRs, to chirps are larger with the ER-2 than with the ER-3A insert earphone due to differences between the corresponding amplitude-frequency responses. Therefore a modified chirp, which equalizes the amplitude-frequency response of the ER-3A, is constructed and subsequently compared to the unmodified chirp. ABRs are recorded from 20 normal-hearing subjects in response to the two chirps delivered by the ER-3A earphone at a wide range of levels. The results confirm that the modified chirp generates significantly larger ABRs than the unmodified chirp at levels below 60 dB nHL.
William Demant Holding A/S, Kongebakken 9, DK-2765 Smoørum, Denmark. ce@demant.dk
Claus
C
Elberling
Manuel
M
Don
Sinnet G B
SG
Kristensen
D000161:Acoustic Stimulation / Q000295:instrumentation*; D000328:Adult; D001301:Audiometry, Pure-Tone / Q000295:instrumentation*; D001306:Auditory Pathways / Q000502:physiology*; D001309:Auditory Threshold; D004867:Equipment Design; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time; D013018:Sound Spectrography; D013997:Time Factors; D055815:Young Adult