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Titolo:
Auditory perception and language: functional imaging of speech sensitive auditory cortex.
Autore:
Samson, Y; Belin, P; Thivard, L; Boddaert, N; Crozier, S; Zilbovicius, M;
Indirizzi:
La Salpetriere, Urgences Cerebrovasc, F-75013 Paris, France La Salpetriere Paris France F-75013 s Cerebrovasc, F-75013 Paris, France CEA, Serv Hosp Frederic Joliot, DRM, F-91406 Orsay, France CEA Orsay France F-91406 osp Frederic Joliot, DRM, F-91406 Orsay, France McGill Univ, Montreal Neurol Inst, Neuropsychol Cognit Neurosci Unit, Montreal, PQ, Canada McGill Univ Montreal PQ Canada ognit Neurosci Unit, Montreal, PQ, Canada La Salpetriere, Serv Soins Suites Neurol, Paris, France La Salpetriere Paris France re, Serv Soins Suites Neurol, Paris, France Necker Enfants Malad, Serv Radiopediat, Paris, France Necker Enfants Malad Paris France alad, Serv Radiopediat, Paris, France CHU Bretonneau, INSERM U316, F-37044 Tours, France CHU Bretonneau Tours France F-37044 , INSERM U316, F-37044 Tours, France
Titolo Testata:
REVUE NEUROLOGIQUE
fascicolo: 8-9, volume: 157, anno: 2001,
parte:, 1
pagine: 837 - 846
SICI:
0035-3787(200109)157:8-9<837:APALFI>2.0.ZU;2-T
Fonte:
ISI
Lingua:
FRE
Soggetto:
EVENT-RELATED FMRI; POSITRON EMISSION TOMOGRAPHY; PET ACTIVATION; HUMAN BRAIN; PLANUM TEMPORALE; 2ND LANGUAGE; ANATOMY; SOUND; PITCH; ATTENTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
66
Recensione:
Indirizzi per estratti:
Indirizzo: Samson, Y La Salpetriere, Urgences Cerebrovasc, Bd Hop, F-75013 Paris, France La Salpetriere Bd Hop Paris France F-75013 -75013 Paris, France
Citazione:
Y. Samson et al., "Auditory perception and language: functional imaging of speech sensitive auditory cortex.", REV NEUROL, 157(8-9), 2001, pp. 837-846

Abstract

Since the description of cortical deafness, it has been known that the superior temporal cortex is bilaterally involved in the initial stages of language auditory perception but the precise anatomical limits and the functionof this area remain debated. Here we reviewed more than 40 recent papers of positron emission tomography and functional magnetic resonance imaging related to language auditory perception, and we performed a meta-analysis of the localization of the peaks of activation in the Talairach's space. We found 8 studies reporting word versus non-word listening contrasts with 54 activation peaks in the temporal lobes. These peaks clustered in a bilateral and well-limited area of the temporal superior cortex, which is here operationally defined as the speech sensitive auditory cortex. This area is more than 4cm long, located in the superior temporal gyrus and the superior temporal sulcus, both anterior and posterior to Heschl's gyrus. It do not include the primary auditory cortex nor the ascending part of the planum temporale. The speech sensitive auditory cortex is not activated by pure tones, environmental sounds, or attention directed toward elementary components of asound such as intensity, pitch, or duration, and thus has some specificityfor speech signals. The specificity is not perfect, since we found a number of non-speech auditory stimuli activating the speech sensitive auditory cortex. Yet the latter studies always involve auditory perception mechanismswhich are also relevant to speech perception either at the level of primitive auditory scene analysis processes, or at the level of specific schema-based recognition processes. The dorsal part of the speech sensitive auditory cortex may be involved in primitive scene analysis processes, whereas distributed activation of this area may contribute to the emergence of a broadclass of "voice" schemas and of more specific "speech schemas/phonetic modules" related to different languages. In addition, this area is activated by language-related lip movement suggesting that a multimodal integration ofthe auditory and the visual information relevant in speech perception occurs at this level. Finally, there is a task-related top-down modulation of the pattern of activation of the speech sensitive auditory cortex which may reflect the fact that the different parts of this structure are connected to different down-stream cortical regions involved in the neural processing of different types of tasks.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 19:47:01