Wavelet analysis of electroencephalographic and electro-oculographic changes during the sleep onset period

Elisa Magosso, Mauro Ursino, Federica Provini, Pasquale Montagna

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study investigates the relationship between changes in the electroencephalogram (EEG) and slow eye movements (SEMs) in the electro-oculogram (EOG) at the wake-sleep transition. Analysis of EEG and EOG is performed by the discrete wavelet transform and utilizes energy functions built within the multiresolution framework. In particular, SEMs are detected automatically by a computerized system, previously developed and validated; core of the system is a function of EOG energies at different scales of decomposition, which defines SEMs in rigorous energetic terms. Changes in EEG rhythms are characterized by considering the relative energy of EEG signal at each scale of decomposition. The analysis has been applied to EEG and EOG signals acquired on fifteen healthy subjects during polysomnography. In all the examined subjects, falling asleep is systematically accompanied by EEG energy redistribution among the different scales and by SEMs occurrence. In particular, SEMs anticipate EEG modifications, preceding alpha blocking and theta intrusion even by several (10-20) minutes. This result suggests that EOG activity may be used to monitor sleepiness and sleep onset and to predict decrease in behavioral performances associated with drowsiness.

Original languageEnglish
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Pages4006-4010
Number of pages5
DOIs
Publication statusPublished - 2007
Event29th Annual International Conference of IEEE-EMBS, Engineering in Medicine and Biology Society, EMBC'07 - Lyon, France
Duration: Aug 23 2007Aug 26 2007

Other

Other29th Annual International Conference of IEEE-EMBS, Engineering in Medicine and Biology Society, EMBC'07
CountryFrance
CityLyon
Period8/23/078/26/07

ASJC Scopus subject areas

  • Biomedical Engineering

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