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Titolo:
Deconvolution of 40 Hz steady-state fields reveals two overlapping source activities of the human auditory cortex
Autore:
Gutschalk, A; Mase, R; Roth, R; Ille, N; Rupp, A; Hahnel, S; Picton, TW; Scherg, M;
Indirizzi:
Univ Heidelberg, Dept Neurol, Div Biomagnetism, D-6900 Heidelberg, GermanyUniv Heidelberg Heidelberg Germany D-6900 sm, D-6900 Heidelberg, Germany Nihon Kohden Corp Tokyo, Tokyo, Japan Nihon Kohden Corp Tokyo Tokyo Japan hon Kohden Corp Tokyo, Tokyo, Japan Univ Heidelberg, Dept Neuroradiol, D-6900 Heidelberg, Germany Univ Heidelberg Heidelberg Germany D-6900 ol, D-6900 Heidelberg, Germany Univdaoronto, Baycrest Ctr Geriatr Care, Rotman Res Inst, Toronto, ON, Cana Univ Toronto Toronto ON Canada Care, Rotman Res Inst, Toronto, ON, Cana
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 5, volume: 110, anno: 1999,
pagine: 856 - 868
SICI:
1388-2457(199905)110:5<856:DO4HSF>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
MIDDLE-LATENCY RESPONSES; EVOKED MAGNETIC-FIELDS; MAXIMUM LENGTH SEQUENCES; TONOTOPIC ORGANIZATION; MACAQUE MONKEYS; CORTICAL ORIGIN; HUMAN SCALP; BRAIN-STEM; POTENTIALS; MODEL;
Keywords:
magnetoencephalography; auditory evoked responses; temporal processing; dipole localisation; auditory cortex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Gutschalk, A Univ Heidelberg, Dept Neurol, Div Biomagnetism, D-6900 Heidelberg, Germany Univ Heidelberg Heidelberg Germany D-6900 idelberg, Germany
Citazione:
A. Gutschalk et al., "Deconvolution of 40 Hz steady-state fields reveals two overlapping source activities of the human auditory cortex", CLIN NEU, 110(5), 1999, pp. 856-868

Abstract

Steady-state auditory evoked fields were recorded from 15 subjects using awhole head MEG system. Stimuli were 800 ms trains of binaural clicks with constant stimulus onset asynchrony (SOA). Seven different SOA settings (19,21, 23, 25, 27, 29 and 31 ms) were used to give click rates near 40 Hz. Transient responses to each click were reconstructed using a new algorithmthat deconvoluted the averaged responses to the different trains. Spatio-temporal multiple dipole modelling in relation to 3D MRI scans revealed two overlapping source components in both the left and right auditory cortex. The primary sources in the medial part of Heschl's gyrus exhibited a N19-P30-N40 m pattern. The secondary, weaker sources at more lateral sites on Heschl's gyrus showed a N24-P36-N46 m pattern. When applied to transient middlelatency auditory evoked fields (MAEFs) recorded at SOAs of 95-135 ms, the primary sources imaged activities similar to the deconvoluted steady-state responses, but the secondary source activities were inconsistent. Linear summation of the deconvoluted source waveforms accounted for more than 96% of the steady-state variance. This indicates that the primary activity of the auditory cortex remains constant up to high stimulation rates and is not specifically enhanced around 40 Hz. (C) 1999 Elsevier Science Ireland Ltd. All rights reserved.

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Documento generato il 18/01/20 alle ore 01:57:18