Auditory-phonetic projection and lexical structure in the recognition of sine-wave words.
J Exp Psychol Hum Percept Perform
; 37(3): 968-77, 2011 Jun.
Article
em En
| MEDLINE
| ID: mdl-21443384
ABSTRACT
Speech remains intelligible despite the elimination of canonical acoustic correlates of phonemes from the spectrum. A portion of this perceptual flexibility can be attributed to modulation sensitivity in the auditory-to-phonetic projection, although signal-independent properties of lexical neighborhoods also affect intelligibility in utterances composed of words. Three tests were conducted to estimate the effects of exposure to natural and sine-wave samples of speech in this kind of perceptual versatility. First, sine-wave versions of the easy and hard word sets were created, modeled on the speech samples of a single talker. The performance difference in recognition of easy and hard words was used to index the perceptual reliance on signal-independent properties of lexical contrasts. Second, several kinds of exposure produced familiarity with an aspect of sine-wave speech (a) sine-wave sentences modeled on the same talker; (b) sine-wave sentences modeled on a different talker, to create familiarity with a sine-wave carrier; and (c) natural sentences spoken by the same talker, to create familiarity with the idiolect expressed in the sine-wave words. Recognition performance with both easy and hard sine-wave words improved after exposure only to sine-wave sentences modeled on the same talker. Third, a control test showed that signal-independent uncertainty is a plausible cause of differences in recognition of easy and hard sine-wave words. The conditions of beneficial exposure reveal the specificity of attention underlying versatility in speech perception.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Psicolinguística
/
Percepção Auditiva
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Acústica da Fala
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Reconhecimento Fisiológico de Modelo
Limite:
Female
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Humans
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Male
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article