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Neural Eng."],"published-print":{"date-parts":[[2025,8,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>\n                  <jats:italic>Objective<\/jats:italic>. The limited spatial resolution inherent in electroencephalography (EEG), a widely-adopted non-invasive neuroimaging technique, combined with the intrinsic complexity of performing unilateral lower-limb motor imagery (MI), restricts decoding accuracy. To address these challenges, we propose a paradigm based on action observation-guided rhythmic motor execution (AO-ME) and motor imagery (AO-MI), designed to simplify task demands and enhance decoding performance. Magnetoencephalography (MEG) serves as the data acquisition method, leveraging its superior spatiotemporal resolution. <jats:italic>Approach<\/jats:italic>. Spatiotemporal and spectral features were characterized at the sensor level, and source imaging techniques were employed to examine cortical activation patterns. Ensemble task-related component analysis (eTRCA) facilitated decoding of unilateral tasks. And multiple decoding algorithms were employed to validate the effectiveness of the proposed paradigm. <jats:italic>Main results<\/jats:italic>. Robust lateralized neural responses were observed, exhibiting low-frequency phase-locked components that distinctly reflected the task frequency and its second harmonic within sensorimotor, parietal, and occipital cortices. Moreover, significant contralateral suppression of the sensorimotor rhythm was observed. Decoding accuracies reached 95.22 \u00b1 4.75% for AO-ME and 88.66 \u00b1 8.52% for AO-MI across twenty participants based on the phase-locked features using eTRCA. <jats:italic>Significance<\/jats:italic>. Collectively, our findings demonstrate that the proposed paradigm provides an effective approach for eliciting robust, distinguishable neural responses, enabling high decoding performance of unilateral lower-limb movements. This work offers new insights into the underexplored domain of lower-limb MI and highlights the paradigm\u2019s potential for brain\u2013computer interface applications.<\/jats:p>","DOI":"10.1088\/1741-2552\/adf011","type":"journal-article","created":{"date-parts":[[2025,7,15]],"date-time":"2025-07-15T22:52:28Z","timestamp":1752619948000},"page":"046029","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Characterizing the neural representations and decoding performance of foot rhythmic motor execution or imagery guided by action observation"],"prefix":"10.1088","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6959-7867","authenticated-orcid":true,"given":"Xu","family":"Wang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0813-652X","authenticated-orcid":true,"given":"Jianjun","family":"Meng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6694-2709","authenticated-orcid":false,"given":"Yu","family":"Zheng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-9466-3077","authenticated-orcid":true,"given":"Yuxuan","family":"Wei","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7536-1674","authenticated-orcid":false,"given":"Fan","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2905-6369","authenticated-orcid":false,"given":"Han","family":"Ding","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0232-6517","authenticated-orcid":false,"given":"Yan","family":"Zhuo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2025,7,28]]},"reference":[{"key":"jneadf011bib1","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1007\/BF00412364","article-title":"Hirnpotential\u00e4nderungen bei willk\u00fcrbewegungen und passiven bewegungen des menschen: bereitschaftspotential und reafferente potentiale","volume":"284","author":"Kornhuber","year":"1965","journal-title":"Pfl\u00fcg. 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