{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:07:36Z","timestamp":1760242056814,"version":"build-2065373602"},"reference-count":23,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2018,12,6]],"date-time":"2018-12-06T00:00:00Z","timestamp":1544054400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100010661","name":"Horizon 2020 Framework Programme","doi-asserted-by":"publisher","award":["727560"],"award-info":[{"award-number":["727560"]}],"id":[{"id":"10.13039\/100010661","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100006473","name":"Ministerio de Ciencia Tecnolog\u00eda y Telecomunicaciones","doi-asserted-by":"publisher","award":["DPI2016-80054-R"],"award-info":[{"award-number":["DPI2016-80054-R"]}],"id":[{"id":"10.13039\/501100006473","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The aim of this work was to develop a new unsupervised exploratory method of characterizing feature extraction and detecting similarity of movement during sleep through actigraphy signals. We here propose some algorithms, based on signal bispectrum and bispectral entropy, to determine the unique features of independent actigraphy signals. Experiments were carried out on 20 randomly chosen actigraphy samples of the Hispanic Community Health Study\/Study of Latinos (HCHS\/SOL) database, with no information other than their aperiodicity. The Pearson correlation coefficient matrix and the histogram correlation matrix were computed to study the similarity of movements during sleep. The results obtained allowed us to explore the connections between certain sleep actigraphy patterns and certain pathologies.<\/jats:p>","DOI":"10.3390\/s18124310","type":"journal-article","created":{"date-parts":[[2018,12,7]],"date-time":"2018-12-07T03:46:14Z","timestamp":1544154374000},"page":"4310","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Feature Extraction and Similarity of Movement Detection during Sleep, Based on Higher Order Spectra and Entropy of the Actigraphy Signal: Results of the Hispanic Community Health Study\/Study of Latinos"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1405-5099","authenticated-orcid":false,"given":"Miguel Enrique","family":"Iglesias Mart\u00ednez","sequence":"first","affiliation":[{"name":"Departamento de Telecomunicaciones, Universidad de Pinar del R\u00edo, Pinar del R\u00edo, Cuba, Mart\u00ed #270, CP: 20100; Instituto Universitario de Matem\u00e1tica Pura y Aplicada, Universitat Polit\u00e8cnica de Val\u00e8ncia (UPV), Camino de Vera s\/n, 46022 Valencia, Espa\u00f1a"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3851-1557","authenticated-orcid":false,"given":"Juan M.","family":"Garc\u00eda-Gomez","sequence":"additional","affiliation":[{"name":"Biomedical Data Science Lab (BDSLab), Instituto Universitario de Tecnolog\u00edas de la Informaci\u00f3n y Comunicaciones (ITACA), Universitat Polit\u00e8cnica de Val\u00e8ncia (UPV), Camino de Vera s\/n, 46022 Valencia, Espa\u00f1a"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlos","family":"S\u00e1ez","sequence":"additional","affiliation":[{"name":"Biomedical Data Science Lab (BDSLab), Instituto Universitario de Tecnolog\u00edas de la Informaci\u00f3n y Comunicaciones (ITACA), Universitat Polit\u00e8cnica de Val\u00e8ncia (UPV), Camino de Vera s\/n, 46022 Valencia, Espa\u00f1a"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0347-7280","authenticated-orcid":false,"given":"Pedro","family":"Fern\u00e1ndez de C\u00f3rdoba","sequence":"additional","affiliation":[{"name":"Instituto Universitario de Matem\u00e1tica Pura y Aplicada, Universitat Polit\u00e8cnica de Val\u00e8ncia (UPV), Camino de Vera s\/n, 46022 Valencia, Espa\u00f1a"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3681-7533","authenticated-orcid":false,"given":"J.","family":"Alberto Conejero","sequence":"additional","affiliation":[{"name":"Instituto Universitario de Matem\u00e1tica Pura y Aplicada, Universitat Polit\u00e8cnica de Val\u00e8ncia (UPV), Camino de Vera s\/n, 46022 Valencia, Espa\u00f1a"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2018,12,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"389","DOI":"10.1016\/S1389-9457(00)00098-8","article-title":"Comparison of actigraphic, polysomnographic, and subjective assessment of sleep parameters in sleep-disordered patients","volume":"2","author":"Kushida","year":"2001","journal-title":"Sleep Med."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1016\/S0165-0270(00)00364-2","article-title":"Sleep estimation from wrist movement quantified by different actigraphic modalities","volume":"105","author":"Kripke","year":"2001","journal-title":"J. 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