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We investigate whether ordinal-pattern-based complexity measures of EEG signals can capture stroke-related alterations in motor imagery (MI) tasks. EEG recordings from 36 stroke patients (acute and minor) and 36 healthy controls were analyzed using permutation entropy (PE), a robust symbolic measure of temporal irregularity. Stroke patients perform left- and right-hand MI tasks, while controls are recorded only under eye-open MI and eye-closed resting conditions. Results show that resting-state EEG from healthy participants exhibits low PE values, reflecting structured and regular dynamics, whereas eye-open MI EEG from the same cohort produces high PE values consistent with near-maximally complex, information-rich neural dynamics. Stroke patients demonstrate intermediate PE values during MI tasks, suggesting altered but partially preserved physiological complexity. These findings indicate that entropy-based measures can distinguish between healthy and stroke-related neural dynamics, providing potential biomarkers for tailoring brain\u2013computer interface (BCI) driven rehabilitation strategies.<\/jats:p>","DOI":"10.1063\/5.0314904","type":"journal-article","created":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T13:49:52Z","timestamp":1780321792000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Ordinal pattern of brain electrical activity as a marker of stroke-induced alterations in motor imagery task"],"prefix":"10.1063","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3036-8223","authenticated-orcid":false,"given":"Aditi","family":"Bose","sequence":"first","affiliation":[{"name":"Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology 1 , Prof C R Rao Road, 500032 Telangana,","place":["India"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-7213-0799","authenticated-orcid":false,"given":"Pragati","family":"Gupta","sequence":"additional","affiliation":[{"name":"Biomedical Research Center, International Institute of Information Technology 2 , Prof C R Rao Road, 500032 Telangana,","place":["India"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4423-3896","authenticated-orcid":false,"given":"Kavita","family":"Vemuri","sequence":"additional","affiliation":[{"name":"Biomedical Research Center, International Institute of Information Technology 2 , Prof C R Rao Road, 500032 Telangana,","place":["India"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-3743-4019","authenticated-orcid":false,"given":"Dhiman","family":"Das","sequence":"additional","affiliation":[{"name":"Physics and Applied Mathematics Unit, Indian Statistical Institute 3 , 203 B. 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