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Erschienen in: Neuroinformatics 4/2022

14.03.2022 | Original Article

Classification of Contrasting Discrete Emotional States Indicated by EEG Based Graph Theoretical Network Measures

verfasst von: Berke Kılıç, Serap Aydın

Erschienen in: Neuroinformatics | Ausgabe 4/2022

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Abstract

The present study shows new findings that reveal the high association between emotional arousal and neuro-functional brain connectivity measures. For this purpose, contrasting discrete emotional states (happiness vs sadness, amusement vs disgust, calmness vs excitement, calmness vs anger, fear vs anger) are classified by using Support Vector Machines (SVMs) driven by Graph Theoretical segregation (clustering coefficients, transitivity, modularity) and integration (global efficiency, local efficiency) measures of the brain network. Emotional EEG data mediated by short duration video film clips is downloaded from publicly available database called DREAMER. Pearson Correlation (PC) and Spearman Correlation have been examined to estimate statistical dependencies between relatively shorter (6 sec) and longer (12 sec) non-overlapped EEG segments across the cortex. Then the corresponding brain connectivity encoded as a graph is transformed into binary numbers with respect to two different thresholds (60%max and mean). Statistical differences between contrasting emotions are obtained by using both one-way Anova tests and step-wise logistic regression modelling in accordance with variables (dependency estimation, segment length, threshold, network measure). Combined integration measures provided the highest classification accuracies (CAs) (75.00% 80.65%) when PC is applied to longer segments in accordance with particular threshold as the mean. The segregation measures also provided useful CAs (74.13% 80.00%), while the combination of both measures did not. The results reveal that discrete emotional states are characterized by balanced network measures even if both segregation and integration measures vary depending on arousal scores of audio-visual stimuli due to neurotransmitter release during video watching.

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Metadaten
Titel
Classification of Contrasting Discrete Emotional States Indicated by EEG Based Graph Theoretical Network Measures
verfasst von
Berke Kılıç
Serap Aydın
Publikationsdatum
14.03.2022
Verlag
Springer US
Erschienen in
Neuroinformatics / Ausgabe 4/2022
Print ISSN: 1539-2791
Elektronische ISSN: 1559-0089
DOI
https://doi.org/10.1007/s12021-022-09579-2

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