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Titolo:
Subcortical neural coding mechanisms for auditory temporal processing
Autore:
Frisina, RD;
Indirizzi:
Univ Rochester, Sch Med & Dent,Rochester Inst Technol, Dept Surg,Natl TechInst Deaf, Otolaryngol Div,Int Ctr Hearing & Speech Res, Rochester, NY 14642 USA Univ Rochester Rochester NY USA 14642 Speech Res, Rochester, NY 14642 USA Univ Rochester, Sch Med & Dent,Rochester Inst Technol, Dept Neurobiol & Anat,Natl Tech Inst Deaf, Otolaryngol Div,Int Ctr Hearing & Speech Res, Rochester, NY 14642 USA Univ Rochester Rochester NY USA 14642 Speech Res, Rochester, NY 14642 USA Univ Rochester, Sch Med & Dent,Rochester Inst Technol, Dept Biomed Engn,Natl Tech Inst Deaf, Otolaryngol Div,Int Ctr Hearing & Speech Res, Rochester,NY 14642 USA Univ Rochester Rochester NY USA 14642 Speech Res, Rochester,NY 14642 USA
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 158, anno: 2001,
pagine: 1 - 27
SICI:
0378-5955(200108)158:1-2<1:SNCMFA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
VENTRAL COCHLEAR NUCLEUS; AMPLITUDE-MODULATED TONES; INFERIOR COLLICULAR NEURONS; SUPERIOR OLIVARY COMPLEX; HIGH-FREQUENCY NEURONS; PHYSIOLOGICALLY CHARACTERIZED REGION; STARLING STURNUS-VULGARIS; NERVE-FIBER RESPONSES; SHORT-TERM ADAPTATION; AGE-RELATED-CHANGES;
Keywords:
amplitude modulation; forward masking; hearing; deafness; aging; ear;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
117
Recensione:
Indirizzi per estratti:
Indirizzo: Frisina, RD Univ Rochester, Sch Med & Dent,Rochester Inst Technol, Dept Surg,Natl TechInst Deaf, Otolaryngol Div,Int Ctr Hearing & Speech Res, 601 Elmwood Ave, Rochester, NY 14642 USA Univ Rochester 601 Elmwood Ave RochesterNY USA 14642 4642 USA
Citazione:
R.D. Frisina, "Subcortical neural coding mechanisms for auditory temporal processing", HEARING RES, 158(1-2), 2001, pp. 1-27

Abstract

Biologically relevant sounds such as speech, animal vocalizations and music have distinguishing temporal features that are utilized for effective auditory perception. Common temporal features include sound envelope fluctuations, often modeled in the laboratory by amplitude modulation (AM), and starts and stops in ongoing sounds. which are frequently approximated by hearing researchers as gaps between two sounds or are investigated in forward masking experiments. The auditory system has evolved many neural processing mechanisms for encoding important temporal features of sound. Due to rapid progress made in the field of auditory neuroscience in the past three decades, it is not possible to review all progress in this field in a single article. The goal of the present report is to focus on single-unit mechanisms inthe mammalian brainstem auditory system for encoding AM and gaps as illustrative examples of how the system encodes key temporal features of sound. This report, following a systems analysis approach, starts with findings in the auditory nerve and proceeds centrally through the cochlear nucleus, superior olivary complex and inferior colliculus. Some general principles can be seen when reviewing this entire field. For example, as one ascends the central auditory system, a neural encoding shift occurs. An emphasis on synchronous responses for temporal coding exists in the auditory periphery, andmore reliance on rate coding occurs as one moves centrally. In addition. for AM, modulation transfer functions become more bandpass as the sound level of the signal is raised, but become more lowpass in shape as background noise is added. In many cases, AM coding can actually increase in the presence of background noise. For gap processing or forward masking, coding for gaps changes from a decrease in spike firing rate for neurons of the peripheral auditory system that have sustained response patterns, to an increase in firing rate for more central neurons with transient responses. Lastly, for gaps and forward masking, as one ascends the auditory system, some suppression effects become quite long (echo suppression), and in some stimulus configurations enhancement to a second sound can take place. (C) 2001 Elsevier Science BN. All rights reserved.

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Documento generato il 22/09/20 alle ore 23:26:32