Electroencephalographic events prior to epileptic major motor seizures
Lopes da Silva, F
Engineering in Medicine and Biology Society (EMBC), 2012 Annual International Conference of the IEEE
Institute of Electrical and Electronics Engineers (IEEE)
Reason for embargo
Under indefinite embargo due to publisher policy. The final version is available from IEEE via the DOI in this record.
Rationale. The goal of this study is to evaluate the electroencephalographic (EEG) events, prior to clonic phases of epileptic motor seizures. Analyzing video sequences we were able to detect these special phases of motor seizures, by image features. This can be used for an early detection and alerting for these events. In the study we analyzed 42 seizures. Based on collected data we compare the quantitative results from video detection of seizures with the features computed from EEG scalp recordings from about 3 minutes prior to the seizure. We analyze the non-stationary frequency spectrum of the EEG recordings and match it against our automated video detection output in order to investigate possible precursory EEG events. Methods. Video recordings are analyzed by applying optical flow theory, reconstruction of geometrical flow invariants, low and high pass filtering, and suitable normalizations. EEG recordings are processed with use of a Gabor wavelet technique. Comparison is achieved by means of analysis of the cross-correlation function between the derivatives of the Gabor DPSOLWXGHVDQG WKH PHDVXUHRI³VHL]XUHQHVV¥SURGXFHG E\RXU video detection algorithm. Results. In the present study certain ranges of EEG frequencies were found, where electro-graphical events precede clonic phases of clinical motor seizures from 2-8 up to 30-40 seconds. These results could be used for construction of new generation of methods for automated motor seizure detection.
Research supported in part by grant 300040003 from ZonMw agency in The Netherlands.
Engineering in Medicine and Biology Society (EMBC), 2012 Annual International Conference of the IEEE, pp. 1028 - 1031
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