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Titolo:
Transformation of binaural response properties in the ascending auditory pathway: Influence of time-varying interaural phase disparity
Autore:
Spitzer, MW; Semple, MN;
Indirizzi:
NYU, Ctr Neural Sci, New York, NY 10003 USA NYU New York NY USA 10003NYU, Ctr Neural Sci, New York, NY 10003 USA UnivLucia,sland, Dept Physiol & Pharmacol, Vis Touch & Hearing Res Ctr, StUniv Queensland St Lucia Qld Australia 4072 s Touch & Hearing Res Ctr, St
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 6, volume: 80, anno: 1998,
pagine: 3062 - 3076
SICI:
0022-3077(199812)80:6<3062:TOBRPI>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUPERIOR OLIVARY COMPLEX; POSTEROVENTRAL COCHLEAR NUCLEUS; INFERIOR COLLICULUS NEURONS; AUDIBLE MOVEMENT ANGLE; LOW-FREQUENCY NEURONS; GUINEA-PIG; LATERAL LEMNISCUS; DORSAL NUCLEUS; SOUND-SOURCE; OLIVOCOCHLEAR NEURONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Semple, MN NYU, Ctr Neural Sci, 4 Washington Pl,Room 809, New York, NY 10003 USA NYU 4 Washington Pl,Room 809 New York NY USA 10003 NY 10003 USA
Citazione:
M.W. Spitzer e M.N. Semple, "Transformation of binaural response properties in the ascending auditory pathway: Influence of time-varying interaural phase disparity", J NEUROPHYS, 80(6), 1998, pp. 3062-3076

Abstract

Previous studies demonstrated that tuning of inferior colliculus (IC) neurons to interaural phase disparity (IPD) is often profoundly influenced by temporal variation of IPD, which simulates the binaural cue produced by a moving sound source. To determine whether sensitivity to simulated motion arises in IC or at an earlier stage of binaural processing we compared responses in IC with those of two major IPD-sensitive neuronal classes in the superior olivary complex (SOC), neurons whose discharges were phase locked (PL)to tonal stimuli and those that were nonphase locked(NPL). Time-varying IPD stimuli consisted of binaural beats, generated by presenting tones of slightly different frequencies to the two ears, and interaural phase modulation (IPM), generated by presenting a pure tone to one ear and a phase modulated tone to the other. IC neurons and NPL-SOC neurons were more sharply tuned to time-varying than to static IPD, whereas PL-SOC neurons were essentially uninfluenced by the mode of stimulus presentation. Preferred IPD was generally similar in responses to static and time-varying TPD for all unit populations. A few IC neurons were highly influenced by the direction and rateof simulated motion, but the major effect for most IC neurons and all SOC neurons was a linear shift of preferred IPD at high rales-attributable to response latency. Most IC and NPL-SOC neurons were strongly influenced by IPM stimuli simulating motion through restricted ranges of azimuth; simulatedmotion through partially overlapping azimuthal ranges elicited discharge profiles that were highly discontiguous, indicating that the response associated with a particular IPD is dependent on preceding portions of the stimulus. In contrast, PL-SOC responses tracked instantaneous IPD throughout the trajectory of simulated motion, resulting in highly contiguous discharge profiles for overlapping stimuli. This finding indicates that responses of PL-SQC units to time-varying IPD reflect only instantaneous IPD with no additional influence of dynamic stimulus attributes. Thus the neuronal representation of auditory spatial information undergoes a major transformation as interaural delay is initially processed in the SOC and subsequently reprocessed in IC. The finding that motion sensitivity in IC emerges from motion-insensitive input suggests that information about change of position is crucial to spatial processing at higher levels of the auditory system.

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Documento generato il 05/12/20 alle ore 14:00:20