Abstract:
OBJECTIVE:To determine the maximum stimulus levels at which a measured auditory steady-state response (ASSR) can be assumed to be a reliable measure of auditory thresholds. DESIGN:ASSR thresholds were measured at octave frequencies from 500 to 4000 Hz in 10 subjects with profound hearing loss. These subjects provided no behavioral responses to sound at the limits of pure-tone audiometers and at the limits of the stimulus levels produced by the ASSR device. Subjects were divided into two groups of five, with repeated measures obtained within the same session in one group and repeated measures obtained in a separate session on a different day in the other group. RESULTS:ASSR thresholds were observed in all 10 subjects at each of four frequencies and in both trials. On average, these ASSR thresholds were observed at 100 dB HL (SD = 5 dB). Because these responses were at least 18 to 22 dB below the limits of the equipment where all subjects had no behavioral responses, it is reasonable to conclude that the ASSRs were not generated by the auditory system. CONCLUSIONS:An artifact or distortion may be present in the recording of ASSRs at high levels. These data bring into question the view that there is a wider dynamic range for ASSR measurements compared with auditory brain stem response measurements, at least with current implementation.
journal_name
Ear Hearjournal_title
Ear and hearingauthors
Gorga MP,Neely ST,Hoover BM,Dierking DM,Beauchaine KL,Manning Cdoi
10.1097/01.aud.0000130801.96611.6bsubject
Has Abstractpub_date
2004-06-01 00:00:00pages
302-7issue
3eissn
0196-0202issn
1538-4667pii
00003446-200406000-00010journal_volume
25pub_type
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