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It is a very important issue how to generalize models across subjects. In this paper, an algorithm is proposed to build high-performance cross-subject motor-imagery brain\u2013computer interfaces (BCIs) for a new subject. First, a novel distance metric is proposed to quantify the joint distribution discrepancy (JDD) between data from different subjects. It gives better evaluations for discrepancies between different distributions than conventional probabilistic metrics. Moreover, it can be extended to design many novel algorithms. Second, a support vector machine combined with JDD (JDMSVM) is proposed for cross-subject classification. For dataset dataIVa, the JDMSVM runs best under 9 out of 15 situations and averagely outperforms counterparts by 10.1%, 9.5%, 3.2% and 1.7%, respectively. For GigaDataset, JDMSVM runs best under 8 of 12 conditions. It averagely outperforms its counterparts by 10.4%, 5.3%, 2.7% and 2.4%, respectively. The experiments demonstrate that the proposed algorithm is effective and competitive for cross-subject BCI. <\/jats:p>","DOI":"10.1142\/s0218126624502050","type":"journal-article","created":{"date-parts":[[2024,1,18]],"date-time":"2024-01-18T14:29:32Z","timestamp":1705588172000},"source":"Crossref","is-referenced-by-count":0,"title":["Cross-Subject Brain\u2013Computer Interfaces with Joint Distribution Alignment"],"prefix":"10.1142","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6504-1418","authenticated-orcid":false,"given":"Xianghong","family":"Zhao","sequence":"first","affiliation":[{"name":"NingboTech University, Ningbo 315100, P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Longhua","family":"Ma","sequence":"additional","affiliation":[{"name":"NingboTech University, Ningbo 315100, P. R. 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