EEG Signal Processing

Dr. Sanei received his PhD from Imperial College of Science, Technology, and Medicine, London, in Biomedical Signal and Image Processing in 1991. His major interest is in biomedical signal and image processing, adaptive and nonlinear signal processing, pattern recognition and classification. He has had a major contribution to Electroencephalogram (EEG) analysis such as epilepsy prediction, cognition evaluation, and brain computer interface (BCI). Currently, he is involved in teaching various undergraduate and postgraduate subjects such as Real-time Signal Processing, Non-linear and Adaptive Signal & Image processing, Intelligent Signal Processing, VHDL based Digital Signal Processing, and Digital Design. Jonathon Chambers joined the Cardiff School of Engineering in January 2004 and leads a team of researchers involved in the analysis, design and evaluation of new algorithms for digital signal processing with application in acoustics, biomedicine and beyond 3G wireless communications, and is the Director of the Centre of Digital Signal Processing and the Group Leader of the Telecommunications and Information Technology Group.

Preface. List of Abbreviations. List of Symbols. 1 Introduction to EEG. 1.1 History. 1.2 Neural Activities. 1.3 Action Potentials. 1.4 EEG Generation. 1.5 Brain Rhythms. 1.6 EEG Recording and Measurement. 1.6.1 Conventional Electrode Positioning. 1.6.2 Conditioning the Signals. 1.7 Abnormal EEG Patterns. 1.8 Ageing. 1.9 Mental Disorders. 1.9.1 Dementia. 1.9.2 Epileptic Seizure and Nonepileptic Attacks. 1.9.3 Psychiatric Disorders. 1.9.4 External Effects. 1.10 Summary and Conclusions. References. 2 Fundamentals of EEG Signal Processing. 2.1 EEG Signal Modelling. 2.1.1 Linear Models. 2.1.2 Nonlinear Modelling. 2.1.3 Generating EEG Signals Based on Modelling the Neuronal Activities. 2.2 Nonlinearity of the Medium. 2.3 Nonstationarity. 2.4 Signal Segmentation. 2.5 Signal Transforms and Joint Time Frequency Analysis. 2.5.1 Wavelet Transform. 2.5.2 Ambiguity Function and the Wigner Ville Distribution. 2.6 Coherency, Multivariate Autoregressive (MVAR) Modelling, and Directed Transfer Function (DTF). 2.7 Chaos and Dynamical Analysis. 2.7.1 Entropy. 2.7.2 Kolmogorov Entropy. 2.7.3 Lyapunov Exponents. 2.7.4 Plotting the Attractor Dimensions from the Time Series. 2.7.5 Estimation of Lyapunov Exponents from the Time Series. 2.7.6 Approximate Entropy. 2.7.7 Using the Prediction Order. 2.8 Filtering and Denoising. 2.9 Principal Component Analysis. 2.9.1 Singular-Value Decomposition. 2.10 Independent Component Analysis. 2.10.1 Instantaneous BSS. 2.10.2 Convolutive BSS. 2.10.3 Sparse Component Analysis. 2.10.4 Nonlinear BSS. 2.10.5 Constrained BSS. 2.11 Application of Constrained BSS: Example. 2.12 Signal Parameter Estimation. 2.13 Classification Algorithms. 2.13.1 Support Vector Machines. 2.13.2 The k-Means Algorithm. 2.14 Matching Pursuits. 2.15 Summary and Conclusions. References. 3 Event-Related Potentials. 3.1 Detection, Separation, Localization, and Classification of P300 Signals. 3.1.1 Using ICA. 3.1.2 Estimating Single Brain Potential Components by Modelling ERP Waveforms. 3.1.3 Source Tracking. 3.1.4 Localization of the ERP. 3.1.5 Time Frequency Domain Analysis. 3.1.6 Adaptive Filtering Approach. 3.1.7 Prony s Approach for Detection of P300 Signals. 3.1.8 Adaptive Time Frequency Methods. 3.2 Brain Activity Assessment Using ERP. 3.3 Application of P300 to BCI. 3.4 Summary and Conclusions. References. 4 Seizure Signal Analysis. 4.1 Seizure Detection. 4.1.1 Adult Seizure Detection. 4.1.2 Detection of Neonate Seizure. 4.2 Chaotic Behaviour of EEG Sources. 4.3 Predictability of Seizure from the EEGs. 4.4 Fusion of EEG fMRI Data for Seizure Prediction. 4.5 Summary and Conclusions. References. 5 EEG Source Localization. 5.1 Introduction. 5.1.1 General Approaches to Source Localization. 5.1.2 Dipole Assumption. 5.2 Overview of the Traditional Approaches. 5.2.1 ICA Method. 5.2.2 MUSIC Algorithm. 5.2.3 LORETA Algorithm. 5.2.4 FOCUSS Algorithm. 5.2.5 Standardized LORETA. 5.2.6 Other Weighted Minimum Norm Solutions. 5.2.7 Evaluation Indices. 5.2.8 Joint ICA LORETA Approach. 5.2.9 Partially Constrained BSS Method. 5.3 Determination of the Number of Sources. 5.4 Summary and Conclusions. References. 6 Sleep EEG. 6.1 Stages of Sleep. 6.1.1 NREM Sleep. 6.1.2 REM Sleep. 6.2 The Influence of Circadian Rhythms. 6.3 Sleep Deprivation. 6.4 Psychological Effects. 6.5 Detection and Monitoring of Brain Abnormalities During Sleep by EEG Analysis. 6.5.1 Detection of the Rhythmic Waveforms and Spindles Incorporating Blind Source Separation. 6.5.2 Application of Matching Pursuit. 6.5.3 Detection of Normal Rhythms and Spindles using Higher Order Statistics. 6.5.4 Application of Neural Networks. 6.5.5 Model-Based Analysis. 6.5.6 Hybrid Methods. 6.6 Concluding Remarks. References. 7 Brain Computer Interfacing. 7.1 State of the Art in BCI. 7.1.1 ERD and ERS. 7.1.2 Transient Beta Activity after the Movement. 7.1.3 Gamma Band Oscillations. 7.1.4 Long Delta Activity. 7.2 Major Problems in BCI. 7.2.1 Preprocessing of the EEGs. 7.3 Multidimensional EEG Decomposition. 7.3.1 Space Time Frequency Method. 7.3.2 Parallel Factor Analysis. 7.4 Detection and Separation of ERP Signals. 7.5 Source Localization and Tracking of the Moving Sources within the Brain. 7.6 Multivariant Autoregressive (MVAR) Modelling and Coherency Maps. 7.7 Estimation of Cortical Connectivity. 7.8 Summary and Conclusions. References. Index.