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Thus, the main goal of this paper is to check whether some Hurst exponent and fractal dimension based estimators become valid indicators to FE in motor imagery BCI. The final results obtained were not optimal as expected, which may be due to the fact that the nature of the analyzed EEG signals in these motor imagery tasks were not self-similar enough.<\/jats:p>","DOI":"10.1142\/s0218127415400234","type":"journal-article","created":{"date-parts":[[2016,1,14]],"date-time":"2016-01-14T14:17:31Z","timestamp":1452781051000},"page":"1540023","source":"Crossref","is-referenced-by-count":3,"title":["Testing the Self-Similarity Exponent to Feature Extraction in Motor Imagery Based Brain Computer Interface Systems"],"prefix":"10.1142","volume":"25","author":[{"given":"Germ\u00e1n","family":"Rodr\u00edguez-Berm\u00fadez","sequence":"first","affiliation":[{"name":"University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, 30720 Santiago de la Ribera, Murcia, Spain"}]},{"given":"Miguel \u00c1ngel","family":"S\u00e1nchez-Granero","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Universidad de Almer\u00eda, 04120 Almer\u00eda, Spain"}]},{"given":"Pedro J.","family":"Garc\u00eda-Laencina","sequence":"additional","affiliation":[{"name":"University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, 30720 Santiago de la Ribera, Murcia, Spain"}]},{"given":"Manuel","family":"Fern\u00e1ndez-Mart\u00ednez","sequence":"additional","affiliation":[{"name":"University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, 30720 Santiago de la Ribera, Murcia, Spain"}]},{"given":"Jos\u00e9","family":"Serna","sequence":"additional","affiliation":[{"name":"University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, 30720 Santiago de la Ribera, Murcia, Spain"}]},{"given":"Joaqu\u00edn","family":"Roca-Dorda","sequence":"additional","affiliation":[{"name":"University Centre of Defence at the Spanish Air Force Academy, MDE-UPCT, 30720 Santiago de la Ribera, Murcia, Spain"}]}],"member":"219","published-online":{"date-parts":[[2016,1,14]]},"reference":[{"key":"S0218127415400234BIB001","doi-asserted-by":"publisher","DOI":"10.1016\/j.cmpb.2005.06.011"},{"key":"S0218127415400234BIB003","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevA.44.2730"},{"key":"S0218127415400234BIB004","doi-asserted-by":"publisher","DOI":"10.1016\/j.physa.2010.05.025"},{"key":"S0218127415400234BIB005","doi-asserted-by":"publisher","DOI":"10.1016\/j.physa.2012.03.037"},{"key":"S0218127415400234BIB006","doi-asserted-by":"publisher","DOI":"10.1088\/1741-2560\/4\/2\/R03"},{"key":"S0218127415400234BIB007","doi-asserted-by":"publisher","DOI":"10.1007\/BF01797193"},{"key":"S0218127415400234BIB008","first-page":"1250044-1","volume":"22","author":"Co Ting Keh L. 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