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Titolo:
Basic properties of the sound-evoked post-auricular muscle response (PAMR)
Autore:
OBeirne, GA; Patuzzi, RB;
Indirizzi:
Univ Western Australia, Dept Physiol, Nedlands, WA 6009, Australia Univ Western Australia Nedlands WA Australia 6009 nds, WA 6009, Australia
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 138, anno: 1999,
pagine: 115 - 132
SICI:
0378-5955(199912)138:1-2<115:BPOTSP>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
POTENTIALS; COMPONENTS;
Keywords:
auditory-evoked potential; objective neonatal screening test; objective audiogram; pinna movement;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Patuzzi, RB Univ Western Australia, Dept Physiol, Nedlands, WA 6009, Australia Univ Western Australia Nedlands WA Australia 6009 , Australia
Citazione:
G.A. O'Beirne e R.B. Patuzzi, "Basic properties of the sound-evoked post-auricular muscle response (PAMR)", HEARING RES, 138(1-2), 1999, pp. 115-132

Abstract

One objective electrophysiological test for deafness involves presenting abrief acoustic stimulus to a subject and measuring the electrical activityevoked in the muscle located just behind the ear (the post-auricular muscle or PAM). Although this electrical response has been known for many years,it has been ignored by most clinicians and frequently misreported in the literature. This paper presents the fundamental properties of the PAM electrical response (the PAMR) and examines wars in which its measurement can be improved by altering the standard electrode position and filtering. The response consists of a simple bipolar compound action potential with a first peak latency of between 12.5 and 15 ms, depending on the stimulus intensity and PAM muscle tone. The largest recordings can be made with an active electrode over the PAM and with the reference electrode on the dorsal surface of the pinna. It can be obtained with click and tone-burst stimuli within 20dB of the subjective detection threshold, can be evoked with tone-bursts between 500 Hz and 16 kHz and grows either linearly with the click level or approximately exponentially with the tone-burst level, reaching a maximum of as large as 250 mu V pp in some subjects. It has a frequency spectrum mostly between 25 and 200 Hz. The response is often visible in raw recordings,with as few as 20 averages required for obtaining a stable waveform. Thereis very little amplitude and latency difference in stimulating the ear on the same side or opposite side to the recording electrodes and the binaurally evoked response is similar to the simple arithmetic sum of the waveformsobtained with monaural stimulation. The response latency and duration are longer in very young infants, but reach adult values by 12 months of age. In a companion paper, we describe a method of enhancing the PAMR using lateral eye movement (Patuzzi and O'Beirne, 1999a). (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 23/01/20 alle ore 12:24:40