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Titolo:
Localization by interaural time difference (ITD): Effects of interaural frequency mismatch
Autore:
Bonham, BH; Lewis, ER;
Indirizzi:
Univ Calif San Francisco, Dept Otolaryngol, San Francisco, CA 94143 USA Univ Calif San Francisco San Francisco CA USA 94143 ancisco, CA 94143 USA Univ Calif San Francisco, WM Keck Ctr Integrat Neurosci, San Francisco, CA94143 USA Univ Calif San Francisco San Francisco CA USA 94143 rancisco, CA94143 USA Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 omp Sci, Berkeley, CA 94720 USA
Titolo Testata:
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
fascicolo: 1, volume: 106, anno: 1999,
pagine: 281 - 290
SICI:
0001-4966(199907)106:1<281:LBITD(>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERIOR OLIVARY COMPLEX; CATS INFERIOR COLLICULUS; CHANGING FREQUENCY; NERVE RESPONSES; NOISE STIMULI; BRAIN-STEM; NEURONS; PROJECTIONS; DELAYS; SENSITIVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Bonham, BH Univ Calif San Francisco, Dept Otolaryngol, Box 0732, San Francisco, CA 94143 USA Univ Calif San Francisco Box 0732 San Francisco CA USA 94143 SA
Citazione:
B.H. Bonham e E.R. Lewis, "Localization by interaural time difference (ITD): Effects of interaural frequency mismatch", J ACOUST SO, 106(1), 1999, pp. 281-290

Abstract

A commonly accepted physiological model for lateralization of low-frequency sounds by interaural time delay (ITD) stipulates that binaural comparisonneurons receive input from frequency-matched channels from each ear. Here,the effects of hypothetical interaural frequency mismatches on this model are reported. For this study, the cat's auditory system peripheral to the binaural comparison neurons was represented by a neurophysiologically derived model, and binaural comparison neurons were represented by cross-correlators. The results of the study indicate that, for binaural comparison neurons receiving input from one cochlear channel from each ear, interaural CF mismatches may serve to either augment or diminish the effective difference in ipsilateral and contralateral axonal time delays from the periphery to the binaural comparison neuron. The magnitude of this increase or decrease inthe effective time delay difference can be up to 400 mu s for CF mismatches of 0.2 octaves or less for binaural neurons with CFs between 250 Hz and 2.5 kHz. For binaural comparison neurons with nominal CFs near 500 Hz, the 25-mu s effective time delay difference caused by a 0.012-octave CF mismatchis equal to the ITD previously shown to be behaviorally sufficient for thecat to lateralize a low-frequency sound source. (C) 1999 Acoustical Society of America. [S0001-4966(99)05206-6].

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Documento generato il 20/09/20 alle ore 06:37:42