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J. Neur. Syst."],"published-print":{"date-parts":[[2022,10]]},"abstract":"<jats:p> The identification of the emotional states corresponding to the four quadrants of the valence\/arousal space has been widely analyzed in the scientific literature by means of multiple techniques. Nevertheless, most of these methods were based on the assessment of each brain region separately, without considering the possible interactions among different areas. In order to study these interconnections, this study computes for the first time the functional connectivity metric called cross-sample entropy for the analysis of the brain synchronization in four groups of emotions from electroencephalographic signals. Outcomes reported a strong synchronization in the interconnections among central, parietal and occipital areas, while the interactions between left frontal and temporal structures with the rest of brain regions presented the lowest coordination. These differences were statistically significant for the four groups of emotions. All emotions were simultaneously classified with a 95.43% of accuracy, overcoming the results reported in previous studies. Moreover, the differences between high and low levels of valence and arousal, taking into account the state of the counterpart dimension, also provided notable findings about the degree of synchronization in the brain within different emotional conditions and the possible implications of these outcomes from a psychophysiological point of view. <\/jats:p>","DOI":"10.1142\/s0129065722500265","type":"journal-article","created":{"date-parts":[[2022,4,26]],"date-time":"2022-04-26T01:53:51Z","timestamp":1650938031000},"source":"Crossref","is-referenced-by-count":20,"title":["Evaluation of Brain Functional Connectivity from Electroencephalographic Signals Under Different Emotional States"],"prefix":"10.1142","volume":"32","author":[{"given":"Beatriz","family":"Garc\u00eda-Mart\u00ednez","sequence":"first","affiliation":[{"name":"Departamento de Sistemas Inform\u00e1ticos, Escuela T\u00e9cnica Superior de Ingenieros Industriales, Universidad de Castilla-La Mancha, 02071 Albacete, Spain"},{"name":"Instituto de Investigaci\u00f3n en Inform\u00e1tica de Albacete, Universidad de Castilla-La Mancha, 02071 Albacete, Spain"}]},{"given":"Antonio","family":"Fern\u00e1ndez-Caballero","sequence":"additional","affiliation":[{"name":"Departamento de Sistemas Inform\u00e1ticos, Escuela T\u00e9cnica Superior de Ingenieros Industriales, Universidad de Castilla-La Mancha, 02071 Albacete, Spain"},{"name":"Instituto de Investigaci\u00f3n en Inform\u00e1tica de Albacete, Universidad de Castilla-La Mancha, 02071 Albacete, Spain"},{"name":"CIBERSAM (Biomedical Research Networking Centre in Mental Health), Madrid, Spain"}]},{"given":"Arturo","family":"Mart\u00ednez-Rodrigo","sequence":"additional","affiliation":[{"name":"Research Group in Electronic, Biomedical and Telecommunication Engineering, Facultad de Comunicaci\u00f3n, Universidad de, Castilla-La Mancha, 16071 Cuenca, Spain"},{"name":"Instituto de Tecnolog\u00edas Audiovisuales de, Castilla-La Mancha, Universidad de Castilla-La, Mancha, 16071 Cuenca, Spain"}]},{"given":"Ra\u00fal","family":"Alcaraz","sequence":"additional","affiliation":[{"name":"Research Group in Electronic, Biomedical and Telecommunication Engineering, Escuela Polit\u00e9cnica de Cuenca, Universidad, de Castilla-La Mancha, 16071 Cuenca, Spain"}]},{"given":"Paulo","family":"Novais","sequence":"additional","affiliation":[{"name":"Algoritmi Center, Department of Informatics, Universidade do Minho, 4800-058 Guimar\u00e4es, Portugal"}]}],"member":"219","published-online":{"date-parts":[[2022,4,23]]},"reference":[{"key":"S0129065722500265BIB001","doi-asserted-by":"publisher","DOI":"10.1155\/2017\/8362741"},{"key":"S0129065722500265BIB002","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.ne.18.030195.002043"},{"key":"S0129065722500265BIB003","doi-asserted-by":"publisher","DOI":"10.1016\/j.tics.2017.12.002"},{"issue":"5","key":"S0129065722500265BIB004","doi-asserted-by":"crossref","first-page":"e0175870","DOI":"10.1371\/journal.pone.0175870","volume":"12","author":"OReilly C.","year":"2017","journal-title":"PLoS ONE"},{"key":"S0129065722500265BIB005","doi-asserted-by":"publisher","DOI":"10.1016\/j.compbiomed.2011.06.020"},{"key":"S0129065722500265BIB006","doi-asserted-by":"publisher","DOI":"10.1142\/S0129065716500428"},{"key":"S0129065722500265BIB007","doi-asserted-by":"publisher","DOI":"10.1177\/1073858417702621"},{"key":"S0129065722500265BIB008","doi-asserted-by":"publisher","DOI":"10.1142\/S0129065717500204"},{"key":"S0129065722500265BIB009","doi-asserted-by":"publisher","DOI":"10.1177\/1550059413480504"},{"key":"S0129065722500265BIB010","doi-asserted-by":"publisher","DOI":"10.1016\/j.bbr.2015.10.036"},{"key":"S0129065722500265BIB011","doi-asserted-by":"publisher","DOI":"10.1016\/j.clinph.2013.08.033"},{"key":"S0129065722500265BIB012","doi-asserted-by":"publisher","DOI":"10.1016\/j.jneumeth.2012.08.020"},{"key":"S0129065722500265BIB013","doi-asserted-by":"publisher","DOI":"10.1016\/j.neulet.2017.04.009"},{"key":"S0129065722500265BIB014","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2019.2944008"},{"key":"S0129065722500265BIB015","doi-asserted-by":"publisher","DOI":"10.1016\/j.jneumeth.2020.108904"},{"key":"S0129065722500265BIB016","doi-asserted-by":"publisher","DOI":"10.1111\/j.1749-6632.2001.tb02755.x"},{"key":"S0129065722500265BIB017","doi-asserted-by":"publisher","DOI":"10.1007\/s00521-021-05694-4"},{"key":"S0129065722500265BIB018","doi-asserted-by":"publisher","DOI":"10.1037\/h0077714"},{"key":"S0129065722500265BIB019","doi-asserted-by":"publisher","DOI":"10.1037\/a0030811"},{"key":"S0129065722500265BIB020","doi-asserted-by":"publisher","DOI":"10.1109\/T-AFFC.2011.15"},{"key":"S0129065722500265BIB021","first-page":"3","volume":"52","author":"Klem G. 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