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Analysis of functional brain connections for positive–negative emotions using phase locking value

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Abstract

In this study, we investigate the brain networks during positive and negative emotions for different types of stimulus (audio only, video only and audio + video) in \(\alpha , \beta\), and \(\gamma\) bands in terms of phase locking value, a nonlinear method to study functional connectivity. Results show notable hemispheric lateralization as phase synchronization values between channels are significant and high in right hemisphere for all emotions. Left frontal electrodes are also found to have control over emotion in terms of functional connectivity. Besides significant inter-hemisphere phase locking values are observed between left and right frontal regions, specifically between left anterior frontal and right mid-frontal, inferior-frontal and anterior frontal regions; and also between left and right mid frontal regions. ANOVA analysis for stimulus types show that stimulus types are not separable for emotions having high valence. PLV values are significantly different only for negative emotions or neutral emotions between audio only/video only and audio only/audio + video stimuli. Finding no significant difference between video only and audio + video stimuli is interesting and might be interpreted as that video content is the most effective part of a stimulus.

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Authors and Affiliations

  1. Computer Engineering Department, Iskenderun Technical University, Hatay, Turkey

    Yasar Dasdemir

  2. Electrical and Electronic Engineering Department, Adana Science and Technology University, Adana, Turkey

    Esen Yildirim

  3. Computer Engineering Department, Adana Science and Technology University, Adana, Turkey

    Serdar Yildirim

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  1. Yasar Dasdemir
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  2. Esen Yildirim
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Correspondence to Yasar Dasdemir.

Appendix

Appendix

Insignificant channels

Insignificant channel pairs after performing permutation test with 1000 surrogate values are shown in Table 5. Significance level is set to \(\alpha =0.01\). In the table, corresponding p values and PLV values are shown below the channel pair.

Number of trials

PLVs are calculated for each electrode pair by averaging across trials which have the same properties; same stimulus type (audio, video, audio + video), same emotion (positive, negative, neutral) for each oscillation (\(\alpha , \beta , \gamma\)). Number of EEG segments collected from all subjects for each condition pair is given in Table 6.

Table 6 Number of stimulus for different conditions
Full size table

Single trial phase locking values (S-PLV) are calculated for each condition, in order to generate the PLV distributions for ANOVA analysis. S-PLV definition is defined in Lachaux et al. (2000) and shown in Eq. 4.

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Dasdemir, Y., Yildirim, E. & Yildirim, S. Analysis of functional brain connections for positive–negative emotions using phase locking value. Cogn Neurodyn 11, 487–500 (2017). https://doi.org/10.1007/s11571-017-9447-z

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