| Time-frequency analysis of the electrocortical activity during maturation using wavelet transform. | |
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MedLine Citation:
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PMID: 8068778 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In this study, we introduce the wavelet transform (WT) as a method for characterizing the maturational changes in electrocortical activity in 24 fetal lambs ranging from 110-144 days gestation (term 145 days). The WT, based on multiresolution signal decomposition, is free of assumptions regarding the characteristics of the signal. The approximation of the electrocortical activity at resolutions varying from 2j+1 to 2j can be extracted by decomposing the signal on a wavelet orthonormal basis of L2(R). We performed multiresolution decomposition for four sets of parameters D2j, where -1 < j < -4. The four series WT represent the detail signal band-widths: (1) 16-32 Hz, (2) 8-16 Hz, (3) 4-8 Hz, (4) 2-4 Hz. The data were divided into three groups according to gestational age: 110-122 days (early), 123-135 days (middle), and 136-144 days (late). In the early group, the power was highest in the fourth signal bandwidth, with relatively low power in the other bands. Increase in gestational age was characterized by increased power in all four bandwidths. Comparison of the cumulative distribution function of the power in the four wavelet bands confirmed the presence of two statistically different patterns in all three age groups. These two patterns correspond to the visually identified patterns of HVSA (high-voltage slow activity) and LVFA (low-voltage fast activity). The earliest development change occurred in HVSA, with progressive increase in power in the 2-8 Hz band. Later changes occurred in LVFA, with a significant increase in power in the 16-32 Hz band.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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M Akay; Y M Akay; P Cheng; H H Szeto |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Biological cybernetics Volume: 71 ISSN: 0340-1200 ISO Abbreviation: Biol Cybern Publication Date: 1994 |
Date Detail:
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Created Date: 1994-09-29 Completed Date: 1994-09-29 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 7502533 Medline TA: Biol Cybern Country: GERMANY |
Other Details:
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Languages: eng Pagination: 169-76 Citation Subset: IM |
Affiliation:
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Department of Biomedical Engineering, Rutgers University, Piscataway, NJ 08855. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Central Nervous System / embryology, physiology* Cybernetics Electroencephalography / methods*, statistics & numerical data Female Fetus / physiology* Fourier Analysis Gestational Age Pregnancy Sheep |
| Grant Support | |
ID/Acronym/Agency:
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DA-00100-10/DA/NIDA NIH HHS; DA-02475-13/DA/NIDA NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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