... In general terms, the procedure of adaptive segmentation could be based on the estimation of the extent of similarity of an initial fixed interval of EEG with an EEG interval of the same duration viewed through the time window running along the EEG recording. ... Beyond the stationary segment to which the model parameters were fitted the prediction error will sharply increase, thus signalling the termination of the foregoing segment and the beginning of the next one. ...
... Assuming that the duration of a minimal stationary interval usually is no less than 2 s, as reported in (McEwen & Anderson 1975), the procedure of EEG segmentation into stationary fragments would consist of four stages. ... However, this segmentation method had a serious disadvantage that some of the fixed intervals should necessary fall on boundaries between the real stationary EEG segments. ... Let us now consider the main approaches to the adaptive segmentation of the EEG signal. ...
... Application of the change-point analysis to the investigation of the brain's electrical activity. ... A vast variety of approaches to the extraction of quantitative features from an EEG signal was introduced during more than 70 years of electroencephalography. ... Therefore, statistical approaches seem to be the most feasible and theoretically satisfactory methodology for the quantitative analysis of the EEG signal up to now. ...
Brain Research Group >> Research >> Change-point analysis ... << previous next >> . ... J. Neurophysiol. ... Amir N., Gath I. Segmentation of EEG during sleep using time-varing autoregressive modelling. ... 1997. ... Barlow J.S. Methods of analysis of nonstationary EEGs, with emphasis on segmentation techniques: a comparative review. J. Clin. ... Electroencephalogr. clin. ... Brain. ... Human Brain Mapping. ... Lehmann D. Multichannel topography of human alpha EEG fields Electroencephalogr. clin. ...
Brain Research Group >> Research >> Change-point analysis ... << previous next >> . ... Application of the change-point analysis to the investigation of the brain's electrical activity. ... The EEG is also an effective tool for brain disease and traumatic lesion diagnostics. ... It is evident, however, that effective control of body functioning requires strict constraining of the number of degrees of freedom at all levels of the brain structural and functional hierarchy. ...
Brain Research Group >> Research >> Change-point analysis ... << previous next >> . ... Unless in many other approaches to the analysis of different signal coupling, the information entering the analysis of synchronization in our approach is explicitly represented in the form of elementary, instantaneous events (the change-points). ... Hence the use of correlation/coherency estimates in parallel with change-point analysis seems to be quite rational. ...
Brain Research Group >> Research >> Change-point analysis ... << previous next >> . ... In this case the simultaneity of the occurrence of the change-points generated by different systems gives an evidence of some kind of connectivity in their functioning. Detailed information about signal generation, as well as constructing the model of the signal, is not required, only some concept of the functionally significant components composing the signal is helpful. ...
Brain Research Group >> Research >> Change-point analysis ... << previous next >> . ... It is necessary to note that a change-point detection method which we applied to a real EEG signal was developed on the basis of the piecewise stationarity model of the signal. ... The data presented in this Chapter demonstrate that the effective detection of the change-points opens the way for a number of new methods of the analysis of complex signals such as the EEG. ...
Brain Research Group >> Research >> Change-point analysis ... << previous next >> . ... It is naturally to treat the change-points appearing close in time in a number of EEG channels as a single complex. We will call it a change-point synchrocomplex , or simply synchrocomplex . ... The spatial configuration of the functionally connected areas may vary dramatically within even short time intervals, and this dynamics may manifest itself in change-point synchrocomplexes. ...
... The most usual indices for functional association between two brain areas are the linear correlation coefficient and coherency estimations computed for a pair of EEG channels. ... The index of change-point coincidence was also found to be sensitive to the condition of open/closed eyes and the interindividual differences in state anxiety, which are other factors influencing the alpha activity. ... Pairs of EEG electrodes where alpha change-point coincidence correlated with state anxiety . ...
Brain Research Group >> Research >> Change-point analysis ... << previous next >> . ... The number of randomly coinciding change-points (the noise level) can be easily estimated using the total numbers of change-points in each EEG channel, and thus the estimate of the number of systematically coinciding change-points can be cleared from the randomly coinciding change-points, both "true" and "false". ... This number, however, vary with the number of change-points in each channel. ...
Brain Research Group >> Research >> Change-point analysis ... << previous next >> . ... Application of the change-point analysis to the investigation of the brain's electrical activity. ... Nonparametric Statistcal Diagnosis: Problems and Methods. ... These potentials were later proved to be the product of the superposition of the electrical activity of tens or hundreds of thousands of neuron cells (neurons) lying in the surface areas of the brain, which is called the cortex. ...
Human Physiology, Vol. ... Analysis of EEG Structural Synchrony in Adolescents with Schizophrenic Disorders S. V. Borisov*, A. Ya. ... The decrease was detected predominantly in the interhemispheric pairs of EEG derivations, as well as in the pairs related to the frontal, temporal (predominantly on the left), and right parietocentral regions. ... Topographic patterns of the ISS (for each of the 120 pairs of EEG derivations) with the ISS stochastic level for the control and test groups. ...
DTD 5 ARTICLE IN PRESS Clinical Neurophysiology xx ( 2004 ) 1-9 www.elsevier.com/locate/clinph EEG filtering based on blind source separation (BSS) for early detection of Alzheimer's disease Andrzej Cichocki a a,b, *, Sergei L. Shishkina, Toshimitsu Mushac, Zbigniew Leonowicza,d, Takashi Asadae, Takayoshi Kurachic Laboratory for Advanced Brain Signal Processing, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan b Warsaw University of Technology, Warsaw ...
... Kaplanb, Hovagim Bakardjiana, 4 Andrzej Cichockia 5 Laboratory for Advanced Brain Signal Processing, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan b Department of Human and Animal Physiology, Faculty of Biology, Moscow State University, Russia a PROOF Combining the extremities on the basis of separation: 2 a new approach to EEG/ERP source localization 3 6 7 8 UNCORRECTED Abstract. ... The localization algorithm can be then applied to each of the separated sources. ...
Trimmed estimators for robust averaging of eventrelated potentials Zbigniew Leonowicz 1, Juha Karvanen and Sergei L. Shishkin 2 Laboratory for Advanced Brain Signal Processing, RIKEN Brain Science Institute, Saitama 351-0198, Japan Abstract Averaging (in statistical terms, estimation of the lo cation of data) is one of the most commonly used pro cedures in neuroscience and the basic pro cedure for obtaining event-related p otentials (ERP). ... Median averaging enhanced strongly the noise. ...
... 8-th Multidisciplinary . International Conference . of Biological Psychiatry . Stress and Behavior" . ... May 17-19, 2004 . ... RSBP-CPBR conferences on biological psychiatry . ... 2001 Moscow, Russia - Stress and Behavior . 2003 Moscow, Russia - Stress and Behavior . 2004 St.Petersburg, Russia - Biological Psychiatry of Stress Last conference (2003, Stress and Behavior) in the Internet: . ... Proceedings of the 6th conference (Moscow, 2001) at Neuroscience.Ru (RUS + ENG) . ...
Centre for Physiology and Biochemical Research (CPBR) The Russian Society for BioPsychiatry (RSBP) 8-th Multidisciplinary International Conference of Biological Psychiatry Stress and Behavior St-Petersburg, Russia [pic] May 17-19, 2004 Welcoming address from the Conference Chair Dear colleagues, I am delighted to welcome the delegates of the 8th Multidisciplinary conference of biological ...