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Automated sleep stage identification system based on time-frequency analysis of a single EEG channel and random forest classifier

In this work, an efficient automated new approach for sleep stage identification based on the new standard of the American academy of sleep medicine (AASM) is presented. The propose approach employs time-frequency analysis and entropy measures for feature extraction from a single electroencephalogra...

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Bibliographic Details
Main Authors: Fraiwan, Luay (Author) , Wenz, Heinrich (Author) , Dickhaus, Hartmut (Author)
Format: Article (Journal)
Language:English
Published: [2012]
In: Computer methods and programs in biomedicine
Year: 2012, Volume: 108, Issue: 1, Pages: 10-19
ISSN:1872-7565
DOI:10.1016/j.cmpb.2011.11.005
Online Access:Verlag, Volltext: http://dx.doi.org/10.1016/j.cmpb.2011.11.005
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0169260711003105
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Author Notes:Luay Fraiwan, Khaldon Lweesy, Natheer Khasawneh, Heinrich Wenz, Hartmut Dickhaus

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520 |a In this work, an efficient automated new approach for sleep stage identification based on the new standard of the American academy of sleep medicine (AASM) is presented. The propose approach employs time-frequency analysis and entropy measures for feature extraction from a single electroencephalograph (EEG) channel. Three time-frequency techniques were deployed for the analysis of the EEG signal: Choi-Williams distribution (CWD), continuous wavelet transform (CWT), and Hilbert-Huang Transform (HHT). Polysomnographic recordings from sixteen subjects were used in this study and features were extracted from the time-frequency representation of the EEG signal using Renyi's entropy. The classification of the extracted features was done using random forest classifier. The performance of the new approach was tested by evaluating the accuracy and the kappa coefficient for the three time-frequency distributions: CWD, CWT, and HHT. The CWT time-frequency distribution outperformed the other two distributions and showed excellent performance with an accuracy of 0.83 and a kappa coefficient of 0.76. 
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