Dynamical aspects of the EEG in different psychopathological states in an interview situation: a pilot study

Schizophrenia Research
B RockstrohT Elbert

Abstract

Dynamical brain states can be characterized by non-linear measures of EEG. The present study shows that critical transitions, i.e., abrupt changes from one dynamic pattern of neural mass activity to another one, may be detected by abrupt variations in local chaoticity. Using an ambulatory device, EEG was recorded from 10 patients with a schizophrenic and two patients with an affective disorder during a series of 25-min interviews. Dynamical aspects, in particular, phase transitions in the EEG-dynamics of the EEG were characterized by means of a measure that continuously estimates the chaoticity of the EEG signal and is thus related to its predictability. Results indicate simpler dynamics of the EEG time series in paranoid-hallucinatory patients, while at the same time these patients tended to exhibit more abrupt transitions/unit of time between different dynamical EEG states. Such sudden phase transitions in brain activity were significantly enhanced prior to expressions of thought disorders that were detected by the interviewer and an observer in the conversation, compared with time periods during the interview without such symptoms.

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Citations

Jan 4, 2001·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Z J KowalikO W Witte
Jan 13, 2006·The Australian and New Zealand Journal of Psychiatry·Michael Breakspear
Jul 28, 2015·The World Journal of Biological Psychiatry : the Official Journal of the World Federation of Societies of Biological Psychiatry·Florence ThibautUNKNOWN WFSBP Task Force on Biological Markers
Jul 25, 2015·The British Journal of Psychiatry : the Journal of Mental Science·Yu-Han ChenJosé M Cañive
Aug 24, 2005·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·C J Stam
Jun 25, 2009·Physiological Measurement·B S RaghavendraJohn P John
May 10, 2017·Frontiers in Psychology·Günter K SchiepekHelmut J Schöller

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