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Nonlinear EEG parameters of emotional perception in patients with moderate traumatic brain injury, coma, stroke and schizophrenia

1 Institute of Higher Nervous Activity and Neurophysiology of RAS, 5A Butlerova St., Moscow 117485, Russia
2 The Pushkin State Russian Language Institute

Objective: The aim of this study was to determine the EEG changes induced by emotional non-verbal sounds using nonlinear signals’ features and also to examine the subjective emotional response in patients with different neurological and psychiatric disorders. Methods: 141 subjects participated in our study: patients after moderate TBI, patients in acute coma, patients after stroke, patients with schizophrenia and controls. 7 types of emotionally charged stimuli were presented. Non-comatose participants were asked to assess the levels of experienced emotions. We analyzed fractal dimension, signal’s envelope parameters and Hjorth mobility and complexity. Results: The Hjorth parameters were negatively correlated with irritation. The fractal dimension was positively correlated with arousal and empathy levels. The only presentation of laughter to post-stroke patients induced the reaction similar to the control group. Conclusions: The results showed that the investigated nonlinear features of resting state EEG are quite group-specific and also specific to the emotional state. Significance: The investigated features could serve to diagnose emotional impairments.
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Keywords EEG; fractal dimension; EEG envelope; Hjorth; schizophrenia; stroke; coma; traumatic brain injury

Citation: Galina V. Portnova, Michael S. Atanov. Nonlinear EEG parameters of emotional perception in patients with moderate traumatic brain injury, coma, stroke and schizophrenia. AIMS Neuroscience, 2018, 5(4): 221-235. doi: 10.3934/Neuroscience.2018.4.221

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