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Titolo:
Spatial spectral analysis of human electrocorticograms including the alphaand gamma bands
Autore:
Freeman, WJ; Rogers, LJ; Holmes, MD; Silbergeld, DL;
Indirizzi:
Univ Calif Berkeley, Dept Mol & Cell Biol LSA 129, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 LSA 129, Berkeley, CA 94720 USA Univ Washington, Sch Med, Dept Neurol, Seattle, WA 98104 USA Univ Washington Seattle WA USA 98104 , Dept Neurol, Seattle, WA 98104 USA Univ Washington, Sch Med, Dept Neurol Surg, Seattle, WA 98195 USA Univ Washington Seattle WA USA 98195 t Neurol Surg, Seattle, WA 98195 USA
Titolo Testata:
JOURNAL OF NEUROSCIENCE METHODS
fascicolo: 2, volume: 95, anno: 2000,
pagine: 111 - 121
SICI:
0165-0270(20000215)95:2<111:SSAOHE>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
OLFACTORY EEG; RESPONSES; PATTERNS; RABBIT;
Keywords:
alpha band; array recording; ECoG; electrocorticogram; gamma band; spatial frequency sampling; spatial spectral analysis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Freeman, WJ Univ Calif Berkeley, Dept Mol & Cell Biol LSA 129, Berkeley, CA 94720 USA Univ Calif Berkeley Berkeley CA USA 94720 keley, CA 94720 USA
Citazione:
W.J. Freeman et al., "Spatial spectral analysis of human electrocorticograms including the alphaand gamma bands", J NEUROSC M, 95(2), 2000, pp. 111-121

Abstract

Spatial spectral analysis is essential for deriving spatial patterns from simultaneous recordings of electrocorticograms (ECoG), in order to determine the optimal interval between electrodes in arrays, and to design spatial filters, particularly for extraction of information about the dynamics of human gamma activity. ECoG were recorded from up to 64 electrodes 0.5 mm apart in a linear array 3.2 cm long, which was placed on the exposed superior temporal gyrus or motor cortex of volunteers undergoing diagnostic surgery. Visual displays of multiple traces revealed broad spectrum oscillations inepisodic bursts having a common aperiodic wave form with recurring patterns of spatial amplitude modulation (AM patterns) on selected portions of thearray. The one-dimensional spatial spectrum of the human ECoG was calculated at successive time samples and averaged over periods of up to 20 s. Log power decreased monotonically with increasing log spatial frequency in cycles/mm (c/mm) to the noise level similar to 2 log units below maximal power at minimal frequency (0.039 +/- 0.002 c/mm). The inflection point at 0.40 +/- 0.05 c/mm specified an optimal value for a low pass spatial filter to remove noise, and an optimal interelectrode spacing of 1.25 mm to avoid undersampling and aliasing. An 8 x 8 array with that spacing would be 10 x 10 mm. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 19:55:48