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It is expensive and time consuming to collect labeled EEG data for use in brain-computer interface (BCI) systems, however. In this paper, a novel active learning method is proposed to minimize the amount of labeled, subject-specific EEG data required for effective classifier training, by combining measures of uncertainty and representativeness within an extreme learning machine (ELM). Following this approach, an ELM classifier was first used to select a relatively large batch of unlabeled examples, whose uncertainty was measured through the best-versus-second-best (BvSB) strategy. The diversity of each sample was then measured between the limited labeled training data and previously selected unlabeled samples, and similarity is measured among the previously selected samples. Finally, a tradeoff parameter is introduced to control the balance between informative and representative samples, and these samples are then used to construct a powerful ELM classifier. Extensive experiments were conducted using benchmark and multiclass motor imagery EEG datasets to evaluate the efficacy of the proposed method. Experimental results show that the performance of the new algorithm exceeds or matches those of several state-of-the-art active learning algorithms. It is thereby shown that the proposed method improves classifier performance and reduces the need for training samples in BCI applications.<\/jats:p>","DOI":"10.1155\/2020\/3287589","type":"journal-article","created":{"date-parts":[[2020,3,10]],"date-time":"2020-03-10T19:35:25Z","timestamp":1583868925000},"page":"1-13","source":"Crossref","is-referenced-by-count":5,"title":["Double-Criteria Active Learning for Multiclass Brain-Computer Interfaces"],"prefix":"10.1155","volume":"2020","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5206-9833","authenticated-orcid":true,"given":"Qingshan","family":"She","sequence":"first","affiliation":[{"name":"Institute of Intelligent Control and Robotics, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kang","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Intelligent Control and Robotics, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, 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