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Titolo:
Specialization of left auditory cortex for speech perception in man depends on temporal coding
Autore:
Liegeois-Chauvel, C; de Graaf, JB; Laguitton, V; Chauvel, P;
Indirizzi:
Univ Mediterranee, INSERM, CJF 9706, Lab Neurophysiol & Neuropsychol, F-13385 Marseille 5, France Univ Mediterranee Marseille France 5 sychol, F-13385 Marseille 5, France
Titolo Testata:
CEREBRAL CORTEX
fascicolo: 5, volume: 9, anno: 1999,
pagine: 484 - 496
SICI:
1047-3211(199907/08)9:5<484:SOLACF>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
VOICE ONSET TIME; SPECIES-SPECIFIC VOCALIZATIONS; WORD DEAFNESS; JAPANESE MACAQUES; CATEGORICAL PERCEPTION; LANGUAGE COMPREHENSION; NEURAL LATERALIZATION; PHONETIC CATEGORIES; PLANUM TEMPORALE; STOP CONSONANTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
86
Recensione:
Indirizzi per estratti:
Indirizzo: Liegeois-Chauvel, C Univ Mediterranee, INSERM, CJF 9706, Lab Neurophysiol & Neuropsychol, 27 Bd Jean Moulin, F-13385 Marseille 5, France Univ Mediterranee 27 Bd Jean Moulin Marseille France 5
Citazione:
C. Liegeois-Chauvel et al., "Specialization of left auditory cortex for speech perception in man depends on temporal coding", CEREB CORT, 9(5), 1999, pp. 484-496

Abstract

Speech perception requires cortical mechanisms capable of analysing and encoding successive spectral (frequency) changes in the acoustic signal. To study temporal speech processing in the human auditory cortex, we recorded intracerebral evoked potentials to syllables in right and left human auditory cortices including Heschl's gyrus (HG), planum temporale (Pi) and the posterior part of superior temporal gyrus (area 22). Natural voiced (/ba/ /da//ga/ and voiceless (/pa/, /ta/, /ka/) syllables, spoken by a native Frenchspeaker, were used to study the processing of a specific temporally based acoustico-phonetic feature, the voice onset time (VOT). This acoustic feature is present in nearly all languages, and it is the VOT that provides the basis for the perceptual distinction between voiced and voiceless consonants. The present results show a lateralized processing of acoustic elements of syllables. First, processing of voiced and voiceless syllables is distinct in the left, but not in the right HG and PT. Second, only the evoked potentials in the left HG, and to a lesser extent in Pi, reflect a sequential processing of the different components of the syllables. Third, we show thatthis acoustic temporal processing is not limited to speech sounds hut applies also to non verbal sounds mimicking the temporal structure of the syllable. Fourth, there was no difference between responses to voiced and voiceless syllables in either left or right areas 22. Our data suggest that a single mechanism in the auditory cortex, involved in general (not only speech-specific) temporal processing, may underlie the further processing of verbal land non-verbal) stimuli. This coding, bilaterally localized in auditory cortex in animals, takes place specifically in the left HG in man. A defectof this mechanism could account for hearing discrimination impairments associated with language disorders.

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Documento generato il 23/01/20 alle ore 04:08:34