title: Wavelet analysis for detection of phasic electromyographic activity in sleep: influence of mother wavelet and dimensionality reduction.
abstract: Phasic electromyographic (EMG) activity during sleep is characterized by brief muscle twitches (duration 100-500ms, amplitude four times background activity). High rates of such activity may have clinical relevance. This paper presents wavelet (WT) analyses to detect phasic EMG, examining both Symlet and Daubechies approaches. Feature extraction included 1s epoch processing with 24 WT-based features and dimensionality reduction involved comparing two techniques: principal component analysis and a feature/variable selection algorithm. Classification was conducted using a linear classifier. Valid automated detection was obtained in comparison to expert human judgment with high (>90%) classification performance for 11/12 datasets.
authors.affiliation: Departments of Neurology and Neurosurgery, Emory University School of Medicine, Atlanta, GA 30322, United States. Electronic address: jafairl@emory.edu.
authors.forename: Jacqueline A
authors.initials: JA
authors.lastname: Fairley
authors.affiliation: Department of Informatics Engineering, Technological Educational Institution of Epirus, Arta, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Georgoulas
authors.affiliation: Departments of Neurology and Neurosurgery, Emory University School of Medicine, Atlanta, GA 30322, United States.
authors.forename: Otis L
authors.initials: OL
authors.lastname: Smart
authors.affiliation: Department of Statistics and Actuarial Financial Mathematics, University of the Aegean, Karlovassi, Samos, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Dimakopoulos
authors.affiliation: Department of Informatics Engineering, Technological Educational Institution of Epirus, Arta, Greece.
authors.forename: Petros
authors.initials: P
authors.lastname: Karvelis
authors.affiliation: Department of Informatics Engineering, Technological Educational Institution of Epirus, Arta, Greece.
authors.forename: Chrysostomos D
authors.initials: CD
authors.lastname: Stylios
authors.affiliation: Departments of Neurology and Neurosurgery, Emory University School of Medicine, Atlanta, GA 30322, United States.
authors.forename: David B
authors.initials: DB
authors.lastname: Rye
authors.affiliation: Departments of Neurology and Neurosurgery, Emory University School of Medicine, Atlanta, GA 30322, United States.
authors.forename: Donald L
authors.initials: DL
authors.lastname: Bliwise
mesh_terms: D000465:Algorithms; D016208:Databases, Factual; D004576:Electromyography / Q000379:methods*; D006801:Humans; D017286:Polysomnography / Q000379:methods*; D025341:Principal Component Analysis; D012894:Sleep Stages / Q000502:physiology*; D058067:Wavelet Analysis
keywords: Electromyogram; Feature extraction; Feature selection; Principal component analysis; Rapid eye movement sleep behavior disorder (RBD); Wavelets