| Literature DB >> 18002493 |
P Y Ktonas1, S Golemati, P Xanthopoulos, V Sakkalis, M D Ortigueira, H Tsekou, M Zervakis, T Paparrigopoulos, C R Soldatos.
Abstract
The time-varying microstructure of sleep EEG spindles may have clinical significance in dementia studies. In this work, the sleep spindle is modeled as an AM-FM signal and parameterized in terms of six parameters, three quantifying the instantaneous envelope (IE) and three quantifying the instantaneous frequency (IF) of the spindle model. The IE and IF waveforms of sleep spindles from patients with dementia and normal controls were estimated using the time-frequency technique of Complex Demodulation (CD). Sinusoidal curve-fitting using a matching pursuit (MP) approach was applied to the IE and IF waveforms for the estimation of the six model parameters. Specific differences were found in sleep spindle instantaneous frequency dynamics between spindles from dementia subjects and spindles from controls.Entities:
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Year: 2007 PMID： 18002493 DOI： 10.1109/IEMBS.2007.4352827
Source DB: PubMed Journal: Annu Int Conf IEEE Eng Med Biol Soc ISSN： 2375-7477