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Titolo:
SPONTANEOUS OTOACOUSTIC EMISSIONS IN THE BOBTAIL LIZARD .2. INTERACTIONS WITH EXTERNAL TONES
Autore:
KOPPL C; MANLEY GA;
Indirizzi:
TECH UNIV MUNICH,INST ZOOL,LICHTENBERGSTR 4 D-85747 GARCHING GERMANY UNIV WESTERN AUSTRALIA,DEPT PHYSIOL NEDLANDS WA 6009 AUSTRALIA
Titolo Testata:
Hearing research
fascicolo: 1-2, volume: 72, anno: 1994,
pagine: 159 - 170
SICI:
0378-5955(1994)72:1-2<159:SOEITB>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
OTO-ACOUSTIC EMISSIONS; AUDITORY-NERVE FIBERS; TILIQUA-RUGOSA; 2-TONE SUPPRESSION; COCHLEA; EARS;
Keywords:
COCHLEA; SOAE; FREQUENCY TUNING; SUPPRESSION; BASILAR PAPILLA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
C. Koppl e G.A. Manley, "SPONTANEOUS OTOACOUSTIC EMISSIONS IN THE BOBTAIL LIZARD .2. INTERACTIONS WITH EXTERNAL TONES", Hearing research, 72(1-2), 1994, pp. 159-170

Abstract

The response of spontaneous otoacoustic emissions to the presentationof external tones was studied in the Australian bobtail lizard. Threebasic types of effects were observed: suppression (a reduction in theemission's amplitude), facilitation (an increase in the emission's amplitude) and frequency shifting. The suppressive effect was highly frequency selective. Iso-suppression tuning curves resembled the rate-threshold tuning curves of the high-frequency population of VIIIth nerve fibres in this species. The frequency with the lowest threshold for suppression corresponded, on average, to the emission's own frequency and did not show any systematic deviation from it. Facilitation of between 2 and 10 dB occurred, but only in response to frequencies within certain narrow ranges, and at sound pressure levels below those that suppressed. The most commonly-observed facilitation range lay between 0.2and 0.6 octaves above the emission's own frequency and coincided in frequency with a characteristic notch in the iso-suppression tuning curve. In the same narrow frequency range, the input/output functions of amplitude suppression always showed a pronounced increase in slope. The emissions moved their own frequency away from that of an external tone. The observed shifts were comparatively large (up to -330 Hz) and were more pronounced in the downward direction.

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Documento generato il 27/11/20 alle ore 04:38:15