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Conventionally, the SVM\u2010MVPA requires careful feature selection\/extraction according to expert knowledge. In this study, we propose a deep neural network (DNN) for directly decoding multiple brain task states from fMRI signals of the brain without any burden for feature handcrafts. We trained and tested the DNN classifier using task fMRI data from the Human Connectome Project's S1200 dataset (\n                    <jats:italic>N<\/jats:italic>\n                    = 1,034). In tests to verify its performance, the proposed classification method identified seven tasks with an average accuracy of 93.7%. We also showed the general applicability of the DNN for transfer learning to small datasets (\n                    <jats:italic>N<\/jats:italic>\n                    = 43), a situation encountered in typical neuroscience research. The proposed method achieved an average accuracy of 89.0 and 94.7% on a working memory task and a motor classification task, respectively, higher than the accuracy of 69.2 and 68.6% obtained by the SVM\u2010MVPA. A network visualization analysis showed that the DNN automatically detected features from areas of the brain related to each task. Without incurring the burden of handcrafting the features, the proposed deep decoding method can classify brain task states highly accurately, and is a powerful tool for fMRI researchers.\n                  <\/jats:p>","DOI":"10.1002\/hbm.24891","type":"journal-article","created":{"date-parts":[[2019,12,9]],"date-time":"2019-12-09T09:20:38Z","timestamp":1575883238000},"page":"1505-1519","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":89,"title":["Decoding and mapping task states of the human brain via deep learning"],"prefix":"10.1002","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8498-7388","authenticated-orcid":false,"given":"Xiaoxiao","family":"Wang","sequence":"first","affiliation":[{"name":"Centers for Biomedical Engineering University of Science and Technology of China  Hefei 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