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    Spatial analysis of multi-channel EEG recordings through a fuzzy-rule based system in the detection of epiletiform events.

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    Author
    James, C.J.
    Jones, R.D.
    Bones, P.J.
    Carroll, G.J.
    Date
    1998
    Permanent Link
    http://hdl.handle.net/10092/3334

    A system has been developed which utilises fuzzy logic to perform spatial analysis of the multichannel EEG recording and forms the final stage of a multi-stage system to detect the presence of epileptiform events (EVs) in the EEG. This spatial-combiner consists of a set of 127 fuzzy-rules which define our expectation of the spatial distribution of an EV as measured across a 4- channel bipolar chain of scalp electrodes. A set of probabilities assigned to each channel by the previous ANN-based stage of the EV-detection system are fuzzified into 5 fuzzy variables and the best matching fuzzy rule gives an output of either definite, probable or possible to indicate a detection of an EV on spatial grounds. The system was tested on 8 clinical EEG recordings (7 epileptiform and 1 normal which indicated a sensitivity of 55.3%, a selectivity of 82.0% and a false detection rate of 7.2/hour. These results show a 50-fold decrease in the false detection rate when compared to the performance of the system without spatial analysis, whilst maintaining a comparable level of sensitivity.

    Subjects
    fuzzy logic
     
    spike detection
     
    EEG
     
    spatialanalysis
     
    Fields of Research::290000 Engineering and Technology::290900 Electrical and Electronic Engineering::290901 Electrical engineering
     
    Fields of Research::320000 Medical and Health Sciences::320700 Neurosciences
    Collections
    • Engineering: Conference Contributions [1816]
    Rights
    http://library.canterbury.ac.nz/ir/rights.shtml

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