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Titolo:
LASER-FEEDBACK MEASUREMENTS OF TURTLE BASILAR-MEMBRANE MOTION USING DIRECT REFLECTION
Autore:
ONEILL MP; BEARDEN A;
Indirizzi:
CALIMETRICS,5901 CHRISTIE AVE,SUITE 406 EMERYVILLE CA 94608 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,GRAD GRP BIOPHYS BERKELEY CA 94720 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,DIV NEUROBIOL BERKELEY CA 94720
Titolo Testata:
Hearing research
fascicolo: 1-2, volume: 84, anno: 1995,
pagine: 125 - 138
SICI:
0378-5955(1995)84:1-2<125:LMOTBM>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
COCHLEAR HAIR-CELLS; FREQUENCY-SELECTIVITY; INNER-EAR; INTERFEROMETRY; MECHANICS; VIBRATION; BUNDLES; LIZARD; CAT;
Keywords:
REPTILE EAR; COCHLEA; BASILAR PAPILLA; FREQUENCY TUNING; LASER-FEEDBACK INTERFEROMETRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
M.P. Oneill e A. Bearden, "LASER-FEEDBACK MEASUREMENTS OF TURTLE BASILAR-MEMBRANE MOTION USING DIRECT REFLECTION", Hearing research, 84(1-2), 1995, pp. 125-138

Abstract

In mammalian hearing, the frequency-dependent spatial pattern of movement in the basilar membrane/organ of Corti complex forms the basis offrequency discrimination. This is not necessarily the case in lower vertebrates; the turtle, for example, has an electrical resonance mechanism in its auditory receptor cells that varies in best frequency fromcell to cell. But how much, if any, of the frequency separation by the turtle is done mechanically by the basilar membrane complex? Attempts to find an investigative approach that avoided placing objects on the basilar membrane led to the rediscovery of laser-feedback interferometry. Laser-feedback interferometric investigations of the vibrationalamplitude and phase of the turtle basilar membrane in response to imposed nanometer displacements of the eardrum reveal that the membrane reflects the broadly-tuned middle-ear filter characteristics. Phase-angle measurements of the basilar membrane as a function of frequency, and the best frequency of the obtained amplitude tuning curves, did not vary as a function of position within each specimen. Input-output functions of the basilar membrane were generally linear. The middle ear demonstrates a negative gain of 2-6 while the central region of the basilar membrane has a positive gain of 4-18 dependent on location and biological variability.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 21:29:12