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Brain\u2013computer interfaces (BCIs) may improve quality of life by controlling external devices. Invasive intracortical BCIs have shown promise in clinical trials but degrade in the chronic period and tether patients to acquisition hardware. Alternatively, electrocorticography (ECoG) records data from electrodes on the cortex, <jats:italic>and studies evaluating fully implanted BCI-ECoG systems are scarce. Objective. We seek to address this need using a fully implanted ECoG-based BCI that allows for home use in SCI.<\/jats:italic>\n                  <jats:italic>Approach.<\/jats:italic> The patient used a long-term BCI system, initially controlling an functional electrical stimulation orthosis in the lab and later using an external mechanical orthosis at home. To evaluate its long-term viability, electrode contact impedance, signal quality, and decoder performance were measured. Signal quality was assessed using signal-to-noise ratio and maximum bandwidth of the signal. Decoder performance was monitored using the area under the receiver operator characteristic curve (AUROC). <jats:italic>Main results.<\/jats:italic> The study analyzed data from the patient\u2019s home environment over 54 months, revealing that the device was used at home for 38 \u00b1 24 min on average daily. After six months, we observed stable event-related desynchronization that aided in determining the onset of motor intention. The decoder\u2019s average AUROC across months was 0.959. Importantly, 40 months of the data collected was gather from the subject\u2019s home or community environment. The results indicate long-term ECoG recordings were stable for motor-imagery classification and motor control in the community environment in a case of an individual with SCI. <jats:italic>Significance.<\/jats:italic> This study presents the long-term feasibility and viability of an ECoG-based BCI system that persists in the home environment in a case of SCI. Future research should explore larger electrode counts with more participants to confirm this stability. Understanding these trends is crucial for clinical utility and chronic viability in broader patient populations.<\/jats:p>","DOI":"10.1088\/1741-2552\/adc48c","type":"journal-article","created":{"date-parts":[[2025,3,24]],"date-time":"2025-03-24T23:26:16Z","timestamp":1742858776000},"page":"026050","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":17,"title":["5-year follow-up of a fully implanted brain\u2013computer interface in a spinal cord injury patient"],"prefix":"10.1088","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0258-077X","authenticated-orcid":true,"given":"Kevin C","family":"Davis","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7321-905X","authenticated-orcid":true,"given":"Kimberley R","family":"Wyse-Sookoo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-9790-1043","authenticated-orcid":true,"given":"Fouzia","family":"Raza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8539-5096","authenticated-orcid":true,"given":"Benyamin","family":"Meschede-Krasa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noeline W","family":"Prins","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Letitia","family":"Fisher","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emery N","family":"Brown","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Iahn","family":"Cajigas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael E","family":"Ivan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan R","family":"Jagid","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9586-9400","authenticated-orcid":true,"given":"Abhishek","family":"Prasad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2025,4,8]]},"reference":[{"key":"jneadc48cbib1","doi-asserted-by":"publisher","first-page":"184","DOI":"10.1159\/000279335","article-title":"Incidence of spinal cord injury worldwide: a systematic review","volume":"34","author":"Van Den Berg","year":"2010","journal-title":"Neuroepidemiology"},{"key":"jneadc48cbib2","author":"National Spinal Cord Injury Statistical","year":"2023"},{"key":"jneadc48cbib3","doi-asserted-by":"publisher","DOI":"10.3389\/fneur.2023.1304153","article-title":"Spinal cord injury: global burden from 1990 to 2019 and projections up to 2030 using Bayesian age-period-cohort analysis","volume":"14","author":"Liu","year":"2023","journal-title":"Front. 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