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Titolo:
Macaque thresholds for detecting increases in intensity: effects of formant structure
Autore:
Le Prell, CG; Niemiec, AJ; Moody, DB;
Indirizzi:
Univ Michigan, Kresge Hearing Res Inst, Sch Med, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 st, Sch Med, Ann Arbor, MI 48109 USA
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 162, anno: 2001,
pagine: 29 - 42
SICI:
0378-5955(200112)162:1-2<29:MTFDII>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUDITORY PROFILE ANALYSIS; FREQUENCY DISCRIMINATION; MONKEY VOCALIZATIONS; DISCHARGE PATTERNS; RHESUS-MONKEY; NERVE FIBERS; REPRESENTATION; COMPONENTS; VOWELS; SOUNDS;
Keywords:
increment detection; profile analysis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Le Prell, CG Univ Michigan, Kresge Hearing Res Inst, Sch Med, 1301 E Ann St, Ann Arbor,MI 48109 USA Univ Michigan 1301 E Ann St Ann Arbor MI USA 48109 48109 USA
Citazione:
C.G. Le Prell et al., "Macaque thresholds for detecting increases in intensity: effects of formant structure", HEARING RES, 162(1-2), 2001, pp. 29-42

Abstract

Macaque monkeys, like humans, are more sensitive to differences in formantfrequency than to differences in the frequency of pure tones (see Sinnott et al. (1987) J. Comp. Psychol. 94, 401-415; Pfingst (1993) J. Acoust. Soc. Am. 93, 2124-2129; Prosen et al. (1990) J. Acoust. Soc. Am. 88, 2152-2158;Sinnott et al. (1985) J. Acoust. Soc. Am. 78, 1977-1985; Sinnott and Kreiter (1991) J. Acoust. Soc. Am. 89,2421-2429; for summary, see May et al. (1996) And. Neurosci. 3, 135-162). In the discrimination of formant frequency,it appears that the relevant cue for macaque monkeys is relative level differences of the component frequencies (Sommers et al. (1992) J. Acoust. Soc. Am. 91, 3499-3510). To further explore the result of Sommers et al., we trained macaque monkeys (Macaca fuscata) to report detection of a change in the spectral shape of multi-component harmonic complexes. Spectral shape changes were produced by the addition of intensity increments. When the amplitude spectrum of the comparison stimulus was modeled after the /ae/ vowel sound, thresholds for detecting a change from the comparison stimulus were lowest when intensity increments were added at spectral peaks. These resultsparallel previous data from human subjects, suggesting that both human andmonkey subjects may process vowel spectra through simultaneous comparisonsof component levels across the spectrum. When the subjects were asked to detect a change from a comparison stimulus with a flat amplitude spectrum, the subjects showed sensitivity that was relatively comparable to that of human subjects tested in other investigations (e.g. Zera. et al. (1993) J. Acoust. Soc. Am. 93, 3431-3441). In additional experiments, neither increasing the. dynamic range of the /ae/ spectrum nor dynamically varying the amplitude of the increment during the stimulus presentation reliably affected detection thresholds. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 25/01/20 alle ore 03:21:05