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Titolo:
Words without mind
Autore:
Schiff, N; Ribary, U; Plum, F; Llinas, R;
Indirizzi:
Cornell Univ, Weill Med Coll, Dept Neurol & Neurosci, New York, NY 10021 USA Cornell Univ New York NY USA 10021 rol & Neurosci, New York, NY 10021 USA NYU, Med Ctr, New York, NY 10012 USA NYU New York NY USA 10012NYU, Med Ctr, New York, NY 10012 USA
Titolo Testata:
JOURNAL OF COGNITIVE NEUROSCIENCE
fascicolo: 6, volume: 11, anno: 1999,
pagine: 650 - 656
SICI:
0898-929X(199911)11:6<650:WWM>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
OSCILLATIONS; HUMANS; HZ; MAGNETOENCEPHALOGRAPHY; SYSTEMS; STATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Schiff, N Cornell Univ, Weill Med Coll, Dept Neurol & Neurosci, 1300 York Ave, New York, NY 10021 USA Cornell Univ 1300 York Ave New York NY USA 10021 k, NY 10021 USA
Citazione:
N. Schiff et al., "Words without mind", J COGN NEUR, 11(6), 1999, pp. 650-656

Abstract

A woman (LR), unconscious for 20 years, spontaneously produces infrequent,isolated words unrelated to any environmental context. Fluorodeoxy-glucose-positron emission tomography (FDG-PET) imaging coregistered with magnetic resonance imaging (MRI) revealed a mean brain metabolism equivalent to deepanesthesia. Nevertheless, PET imaging demonstrated islands of modestly higher metabolism that included Broca's and Wernicke's areas. Functional brainimaging with magnetoencephalographic (MEG) imaging, a technique providing a temporal resolution of better than 1 msec, identified preserved dynamic patterns of spontaneous and evoked brain activity in response to sensory stimulation. Specifically, we examined spontaneous gamma-band activity (near 40 Hz) and its reset or modification during early auditory processing, a measure that correlates with human perception of sensory stimuli Joliot, Ribary, Sr Llinas, 1994). Evidence of abnormal and incomplete gamma-band responses appeared in the left hemisphere only in response to auditory or somatosensory stimulation. MEG single-dipole reconstructions localized to the auditory cortex in the left hemisphere and overlapped with metabolically active regions identified by FDG-PET. The observation demonstrates that isolated neuronal groups may express well-defined fragments of activity in a severelydamaged, unconscious brain. The motor fixed-action pattern character of her expressed words supports the notion of brain modularity in word generation.

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Documento generato il 12/07/20 alle ore 02:52:39