Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Rate and timing cues associated with the cochlear amplifier: Level discrimination based on monaural cross-frequency coincidence detection
Autore:
Heinz, MG; Colburn, HS; Carney, LH;
Indirizzi:
MIT, Speech & Hearing Sci Program, Div Hlth Sci & Technol, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139 iv Hlth Sci & Technol, Cambridge, MA 02139 USA Boston Univ, Biomed Engn Dept, Hearing Res Ctr, Boston, MA 02215 USA Boston Univ Boston MA USA 02215 pt, Hearing Res Ctr, Boston, MA 02215 USA
Titolo Testata:
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
fascicolo: 4, volume: 110, anno: 2001,
pagine: 2065 - 2084
SICI:
0001-4966(200110)110:4<2065:RATCAW>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUDITORY-NERVE FIBERS; SENSORINEURAL HEARING-LOSS; DIFFERING SPONTANEOUS RATE; INTENSITY DISCRIMINATION; BASILAR-MEMBRANE; CENTRAL PROJECTIONS; DISCHARGE PATTERNS; SEVERE DEPARTURE; RATE RESPONSES; NEURAL SYNCHRONIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Engineering, Computing & Technology
Citazioni:
103
Recensione:
Indirizzi per estratti:
Indirizzo: Heinz, MG Johns Hopkins Univ, Dept Biomed Engn, 505 Traylor Bldg,720 Rutland Ave, Baltimore, MD 21205 USA Johns Hopkins Univ 505 Traylor Bldg,720 Rutland Ave Baltimore MD USA 21205
Citazione:
M.G. Heinz et al., "Rate and timing cues associated with the cochlear amplifier: Level discrimination based on monaural cross-frequency coincidence detection", J ACOUST SO, 110(4), 2001, pp. 2065-2084

Abstract

The perceptual significance of the cochlear amplifier was evaluated by predicting level-discrimination performance based on stochastic auditory-nerve(AN) activity. Performance was calculated for three models of processing: the optimal all-information processor (based on discharge times), the optimal rate-place processor (based on discharge counts), and a monaural coincidence-based processor that uses a non-optimal combination of rate and temporal information. An analytical AN model included compressive magnitude and level-dependent-phase responses associated with the cochlear amplifier, and high-, medium-, and low-spontaneous-rate (SR) fibers with characteristic frequencies (CFs) spanning the AN population. The relative contributions of nonlinear magnitude and nonlinear phase responses to level encoding were compared by using four versions of the model, which included and excluded the nonlinear gain and phase responses in all possible combinations. Nonlinear basilar-membrane (BM) phase responses are robustly encoded in near-CF AN fibers at low frequencies. Strongly compressive BM responses at high frequencies near CF interact with the high thresholds of low-SR AN fibers to produce large dynamic ranges. Coincidence performance based on a narrow range of AN CFs was robust across a wide dynamic range at both low and high frequencies, and matched human performance levels. Coincidence performance based onall CFs demonstrated the "near-miss" to Weber's law at low frequencies andthe high-frequency "mid-level bump. " Monaural coincidence detection is a physiologically realistic mechanism that is extremely general in that it canutilize AN information (average-rate, synchrony, and nonlinear-phase cues)from all SR groups. (C) 2001 Acoustical Society of America.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 00:42:28