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Titolo:
Frequency-specific threshold determination with the CERAgram method: Basicprinciple and retrospective evaluation of data
Autore:
Ross, B; Lutkenhoner, B; Pantev, C; Hoke, M;
Indirizzi:
Univ Munster, Inst Expt Audiol, D-48129 Munster, Germany Univ Munster Munster Germany D-48129 pt Audiol, D-48129 Munster, Germany
Titolo Testata:
AUDIOLOGY AND NEURO-OTOLOGY
fascicolo: 1, volume: 4, anno: 1999,
pagine: 12 - 27
SICI:
1420-3030(199901/02)4:1<12:FTDWTC>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUDITORY-EVOKED-POTENTIALS; STEADY-STATE RESPONSES; BRAIN-STEM RESPONSES; OBJECTIVE DETECTION; STATISTICAL TESTS; SIGNAL-DETECTION; DOMAIN; AUDIOMETRY; NOISE;
Keywords:
evoked response audiometry; cortical evoked response audiometry; auditory evoked potential; hearing threshold; Rayleigh test; signal detection;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Ross, B Univ,Munster, Inst Expt Audiol, Kardinal von Galen Ring 10, D-48129 Munster Univ Munster Kardinal von Galen Ring 10 Munster Germany D-48129 r
Citazione:
B. Ross et al., "Frequency-specific threshold determination with the CERAgram method: Basicprinciple and retrospective evaluation of data", AUDIOL NEUR, 4(1), 1999, pp. 12-27

Abstract

A method for the objective evaluation of the hearing threshold using cortical evoked response audiometry was developed. The method results in a kind of objective audiogram, visualizing the significance of an auditory evoked potential (AEP) in a scheme similar to a conventional audiogram. In the present implementation of the method, four frequencies are tested quasi-simultaneously (500, 1000, 2000 and 3000 Hz; intensity steps of 5 dB). The significance of an evoked potential is assessed by means of the Rayleigh test, which is applied to the phase values derived from certain time windows of thesingle-trial epochs. A retrospective analysis of 1,920 threshold estimations in 240 subjects suggested that the detection threshold (lowest stimulus intensity yielding a significant response) was, on the average, 7.5 dB above the electrophysiological threshold (intensity where the AEP amplitude vanishes). The grand-average amplitude-intensity characteristic was approximated by the function a(1 - exp(-I/b)), with a = 6.25 mu V, b = 22.3 dB and I representing the intensity (in decibels) relative to the electrophysiological threshold.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 20:33:22