Key result
Nonlinear EEG features induced by emotional non-verbal sounds correlated with subjective emotional responses, with Hjorth parameters negatively correlating with irritation.
Why the study?
Does the presentation of emotional non-verbal sounds induce specific nonlinear EEG changes in patients with neurological and psychiatric disorders compared to controls?
Observational (n=141)
Does the presentation of emotional non-verbal sounds induce specific nonlinear EEG changes in patients with neurological and psychiatric disorders compared to controls?
Nonlinear EEG features are group-specific and sensitive to emotional states, suggesting potential utility in diagnosing emotional impairments in neurological and psychiatric patients.
Nonlinear EEG may track emotional responses in neurological patients; hypothesis-generating for diagnostics and requires prospective validation.
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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Portnova et al. (2018) conducted an observational in Moderate TBI, acute coma, stroke, schizophrenia (n=141). Emotional non-verbal sounds vs. Healthy controls was evaluated on EEG changes (fractal dimension, signal's envelope parameters, Hjorth mobility and complexity) and subjective emotional response. Nonlinear EEG features induced by emotional non-verbal sounds correlated with subjective emotional responses, with Hjorth parameters negatively correlating with irritation.
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