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Titolo:
DISTORTION-PRODUCT OTOACOUSTIC EMISSIONS IN THE BOBTAIL LIZARD .2. SUPPRESSION TUNING CHARACTERISTICS
Autore:
KOPPL C; MANLEY GA;
Indirizzi:
TECH UNIV MUNICH,INST ZOOL,LICHTENBERGSTR 4 W-8046 GARCHING GERMANY
Titolo Testata:
The Journal of the Acoustical Society of America
fascicolo: 5, volume: 93, anno: 1993,
pagine: 2834 - 2844
SICI:
0001-4966(1993)93:5<2834:DOEITB>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUDITORY-NERVE FIBERS; ACOUSTIC DISTORTION; TILIQUA-RUGOSA; EAR; 2F1-F2; BEHAVIOR; PATTERNS; GERBIL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
C. Koppl e G.A. Manley, "DISTORTION-PRODUCT OTOACOUSTIC EMISSIONS IN THE BOBTAIL LIZARD .2. SUPPRESSION TUNING CHARACTERISTICS", The Journal of the Acoustical Society of America, 93(5), 1993, pp. 2834-2844

Abstract

The otoacoustic distortion products (DP) 2 f1-f2 and 2 f2-f1 in the ear canal of the bobtail lizard are suppressed by tones in a frequency-selective way. Iso-suppression tuning curves for DP generated by low-level primary tones resemble in detail (e.g., in their threshold and frequency selectivity) excitatory iso-rate tuning curves for single auditory-nerve fibers of this species. The best suppressive frequencies for the DP 2 f1-f2 at low primary-tone levels were near the first primary tone (f1), those for 2 f2-f1 lay near or above f2. When using high primary-tone levels to generate the DP, the best frequency for suppression of 2 f1-f2 shifted to half an octave below f1 . Facilitation of both DP was also seen, most often over a restricted frequency range above f2 and at levels below those eliciting suppression. The two DP showed a number of differences in their behavior in the presence of a thirdtone that suggest that they do not originate from the same location or source. These results indicate that in this species, suppression tuning curves of DP generated by low-level primary tones resemble those from mammals in many respects and yield accurate information concerningthe integrity of the hearing organ. It is remarkable that, in spite of substantial differences in hearing-organ structure and function, DP patterns in this lizard are so similar to those of mammals. This suggests that the mechanisms generating the DP patterns are based on basic hair-cell properties and not on special structural constellations of hair cells or their accessory structures.

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Documento generato il 30/11/20 alle ore 03:29:43