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Titolo:
Spectral and temporal processing in human auditory cortex
Autore:
Zatorre, RJ; Belin, P;
Indirizzi:
McGill Univ, Montreal Neurol Inst, Montreal, PQ H3A 2B4, Canada McGill Univ Montreal PQ Canada H3A 2B4 Inst, Montreal, PQ H3A 2B4, Canada
Titolo Testata:
CEREBRAL CORTEX
fascicolo: 10, volume: 11, anno: 2001,
pagine: 946 - 953
SICI:
1047-3211(200110)11:10<946:SATPIH>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPEECH-PERCEPTION; SOUND FEATURES; BLOOD-FLOW; PITCH; DISCRIMINATION; LATERALIZATION; REPRESENTATION; SPECIALIZATION; ASYMMETRIES; RECOGNITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Zatorre, RJ McGill Univ, Montreal Neurol Inst, 3801 Univ St, Montreal, PQ H3A 2B4, Canada McGill Univ 3801 Univ St Montreal PQ Canada H3A 2B4 B4, Canada
Citazione:
R.J. Zatorre e P. Belin, "Spectral and temporal processing in human auditory cortex", CEREB CORT, 11(10), 2001, pp. 946-953

Abstract

We used positron emission tomography to examine the response of human auditory cortex to spectral and temporal variation. Volunteers listened to sequences derived from a standard stimulus, consisting of two pure tones separated by one octave alternating with a random duty cycle. In one series of five scans, spectral information (tone spacing) remained constant while speedof alternation was doubled at each level. In another five scans, speed waskept constant while the number of tones sampled within the octave was doubled at each level, resulting in increasingly fine frequency differences. Results indicated that (i) the core auditory cortex in both hemispheres responded to temporal variation, while the anterior superior temporal areas bilaterally responded to the spectral variation; and (ii) responses to the temporal features were weighted towards the left, while responses to the spectral features were weighted towards the right. These findings confirm the specialization of the left-hemisphere auditory cortex for rapid temporal processing, and indicate that core areas are especially involved in these processes. The results also indicate a complementary hemispheric specialization in right-hemisphere belt cortical areas for spectral processing. The data provide a unifying framework to explain hemispheric asymmetries in processingspeech and tonal patterns. We propose that differences exist in the temporal and spectral resolution of corresponding fields in the two hemispheres, and that they may be related to anatomical hemispheric asymmetries in myelination and spacing of cortical columns.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 12:18:36