R G Andrzejak

Summary

Country: Germany

Publications

  1. ncbi The epileptic process as nonlinear deterministic dynamics in a stochastic environment: an evaluation on mesial temporal lobe epilepsy
    R G Andrzejak
    Department of Epileptology, Medical Center, University of Bonn, Sigmund Freud Str 25, 53105, Bonn, Germany
    Epilepsy Res 44:129-40. 2001
  2. ncbi Indications of nonlinear deterministic and finite-dimensional structures in time series of brain electrical activity: dependence on recording region and brain state
    R G Andrzejak
    Department of Epileptology, University of Bonn, Sigmund Freud Strasse 25, 53105 Bonn, Germany
    Phys Rev E Stat Nonlin Soft Matter Phys 64:061907. 2001
  3. ncbi Seizure prediction: any better than chance?
    Ralph G Andrzejak
    Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona, Spain
    Clin Neurophysiol 120:1465-78. 2009
  4. ncbi Improved spatial characterization of the epileptic brain by focusing on nonlinearity
    Ralph G Andrzejak
    John von Neumann Institute for Computing, Forschungszentrum Julich GmbH, Julich, Germany
    Epilepsy Res 69:30-44. 2006
  5. ncbi Nonlinear EEG analysis in epilepsy: its possible use for interictal focus localization, seizure anticipation, and prevention
    K Lehnertz
    Department of Epileptology and Institute for Radiation and Nuclear Physics, University of Bonn, Germany
    J Clin Neurophysiol 18:209-22. 2001
  6. ncbi Using bivariate signal analysis to characterize the epileptic focus: the benefit of surrogates
    R G Andrzejak
    Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona, Spain
    Phys Rev E Stat Nonlin Soft Matter Phys 83:046203. 2011
  7. ncbi Discerning nonstationarity from nonlinearity in seizure-free and preseizure EEG recordings from epilepsy patients
    Christoph Rieke
    Department of Epileptology, University of Bonn, Sigmund Freud Str 25, 53105 Bonn, Germany
    IEEE Trans Biomed Eng 50:634-9. 2003
  8. ncbi On the predictability of epileptic seizures
    Florian Mormann
    Department of Epileptology, University of Bonn, Sigmund Freud Strasse 25, 53105 Bonn, Germany
    Clin Neurophysiol 116:569-87. 2005
  9. ncbi Seizure anticipation: Do mathematical measures correlate with video-EEG evaluation?
    Florian Mormann
    Epilepsia 46:1335-6; author reply 1336-7. 2005
  10. ncbi A distributed computing system for multivariate time series analyses of multichannel neurophysiological data
    Andy Müller
    Department of Epileptology, Neurophysics Group, University of Bonn, Sigmund Freud Str 25, D 53105 Bonn, Germany
    J Neurosci Methods 152:190-201. 2006

Detail Information

Publications15

  1. ncbi The epileptic process as nonlinear deterministic dynamics in a stochastic environment: an evaluation on mesial temporal lobe epilepsy
    R G Andrzejak
    Department of Epileptology, Medical Center, University of Bonn, Sigmund Freud Str 25, 53105, Bonn, Germany
    Epilepsy Res 44:129-40. 2001
    ..In all investigated cases, this differentiation allowed to retrospectively determine the side of the epileptogenic zone in full agreement with results of the presurgical workup...
  2. ncbi Indications of nonlinear deterministic and finite-dimensional structures in time series of brain electrical activity: dependence on recording region and brain state
    R G Andrzejak
    Department of Epileptology, University of Bonn, Sigmund Freud Strasse 25, 53105 Bonn, Germany
    Phys Rev E Stat Nonlin Soft Matter Phys 64:061907. 2001
    ..Strongest indications of nonlinear deterministic dynamics were found for seizure activity. Results of the other sets were found to be inbetween these two extremes...
  3. ncbi Seizure prediction: any better than chance?
    Ralph G Andrzejak
    Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona, Spain
    Clin Neurophysiol 120:1465-78. 2009
    ..For this purpose, analytical performance estimates and seizure predictor surrogates were introduced. We here extend the Monte Carlo framework of seizure predictor surrogates by introducing alarm times surrogates...
  4. ncbi Improved spatial characterization of the epileptic brain by focusing on nonlinearity
    Ralph G Andrzejak
    John von Neumann Institute for Computing, Forschungszentrum Julich GmbH, Julich, Germany
    Epilepsy Res 69:30-44. 2006
    ..Focusing on nonlinearity by using a combination of nonlinear measures with surrogates appears as the key to a successful characterization of the spatial distribution of the epileptic process...
  5. ncbi Nonlinear EEG analysis in epilepsy: its possible use for interictal focus localization, seizure anticipation, and prevention
    K Lehnertz
    Department of Epileptology and Institute for Radiation and Nuclear Physics, University of Bonn, Germany
    J Clin Neurophysiol 18:209-22. 2001
    ..The unequivocal definition of such a state with a sufficient length would enable investigations of basic mechanisms leading to seizure initiation in humans, and development of adequate seizure prevention strategies...
  6. ncbi Using bivariate signal analysis to characterize the epileptic focus: the benefit of surrogates
    R G Andrzejak
    Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona, Spain
    Phys Rev E Stat Nonlin Soft Matter Phys 83:046203. 2011
    ..The highest significance and accuracy is obtained for the surrogate-corrected nonlinear interdependence measure...
  7. ncbi Discerning nonstationarity from nonlinearity in seizure-free and preseizure EEG recordings from epilepsy patients
    Christoph Rieke
    Department of Epileptology, University of Bonn, Sigmund Freud Str 25, 53105 Bonn, Germany
    IEEE Trans Biomed Eng 50:634-9. 2003
    ..These differences seem most prominent for recording sites within the seizure-generating area and for EEG segments less than one minute's length...
  8. ncbi On the predictability of epileptic seizures
    Florian Mormann
    Department of Epileptology, University of Bonn, Sigmund Freud Strasse 25, 53105 Bonn, Germany
    Clin Neurophysiol 116:569-87. 2005
    ..In this paper, we evaluate the predictability of seizures by comparing the predictive performance of a variety of univariate and bivariate measures comprising both linear and non-linear approaches...
  9. ncbi Seizure anticipation: Do mathematical measures correlate with video-EEG evaluation?
    Florian Mormann
    Epilepsia 46:1335-6; author reply 1336-7. 2005
  10. ncbi A distributed computing system for multivariate time series analyses of multichannel neurophysiological data
    Andy Müller
    Department of Epileptology, Neurophysics Group, University of Bonn, Sigmund Freud Str 25, D 53105 Bonn, Germany
    J Neurosci Methods 152:190-201. 2006
    ..Results indicate that for most of the currently available analysis techniques, calculations can be performed in real time, which, in principle, allows on-line analyses at relatively low cost...
  11. ncbi Seizure prediction by nonlinear EEG analysis
    Klaus Lehnertz
    Department of Epileptology, University of Bonn, Germany
    IEEE Eng Med Biol Mag 22:57-63. 2003
  12. ncbi Seizure prediction: the long and winding road
    Florian Mormann
    Department of Epileptology, University of Bonn, Bonn, Germany
    Brain 130:314-33. 2007
    ..We will give an account of the current state of this research field, point towards possible future developments and propose methodological guidelines for future studies on seizure prediction...
  13. ncbi Measure profile surrogates: a method to validate the performance of epileptic seizure prediction algorithms
    Thomas Kreuz
    John von Neumann Institute for Computing, Forschungszentrum Julich, 52425 Jülich Germany
    Phys Rev E Stat Nonlin Soft Matter Phys 69:061915. 2004
    ..We would like to stress that the proposed method is rather universal and can be applied to many other prediction and detection problems...
  14. ncbi Epileptic seizures are preceded by a decrease in synchronization
    Florian Mormann
    Department of Epileptology, University of Bonn, Sigmund Freud Strasse 25, 53105 Bonn, Germany
    Epilepsy Res 53:173-85. 2003
    ....
  15. ncbi Testing the null hypothesis of the nonexistence of a preseizure state
    Ralph G Andrzejak
    John von Neumann Institute for Computing, Forschungszentrum Julich, 52425 Julich, Germany
    Phys Rev E Stat Nonlin Soft Matter Phys 67:010901. 2003
    ..In consequence, the evaluation of the reported performance values is problematic. Here, we propose the technique of seizure time surrogates based on a Monte Carlo simulation to remedy this deficit...