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Raw ECoG signals or certain frequency bands of the ECoG power were converted into images whose vertical axis was electrode number and whose horizontal axis was time in milliseconds, which were used as training data. These data were classified with four labels (Rest, Mouth open, Water injection, and Swallowing). Deep transfer learning was carried out using AlexNet, and power in the high-[Formula: see text] band (75\u2013150[Formula: see text]Hz) was the training set. Accuracy reached 74.01%, sensitivity reached 82.51%, and specificity reached 95.38%. However, using the raw ECoG signals, the accuracy obtained was 76.95%, comparable to that of the high-[Formula: see text] power. We demonstrated that a version of AlexNet pre-trained with visually meaningful images can be used for transfer learning of visually meaningless images made up of ECoG signals. Moreover, we could achieve high decoding accuracy using the raw ECoG signals, allowing us to dispense with the conventional extraction of high-[Formula: see text] power. Thus, the images derived from the raw ECoG signals were equivalent to those derived from the high-[Formula: see text] band for transfer deep learning. <\/jats:p>","DOI":"10.1142\/s0129065720500562","type":"journal-article","created":{"date-parts":[[2020,9,17]],"date-time":"2020-09-17T03:08:28Z","timestamp":1600312108000},"source":"Crossref","is-referenced-by-count":18,"title":["A Swallowing Decoder Based on Deep Transfer Learning: AlexNet Classification of the Intracranial Electrocorticogram"],"prefix":"10.1142","volume":"31","author":[{"given":"Hiroaki","family":"Hashimoto","sequence":"first","affiliation":[{"name":"Department of Neurological Diagnosis and Restoration, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"},{"name":"Department of Neurosurgery, Otemae Hospital, Chuo-Ku Otemae 1-5-34, Osaka, Osaka 540-0008, Japan"},{"name":"Endowed Research Department of Clinical Neuroengineering, Global Center for Medical Engineering and Informatics, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Seiji","family":"Kameda","sequence":"additional","affiliation":[{"name":"Department of Neurological Diagnosis and Restoration, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Hitoshi","family":"Maezawa","sequence":"additional","affiliation":[{"name":"Department of Neurological Diagnosis and Restoration, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Satoru","family":"Oshino","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Naoki","family":"Tani","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Hui Ming","family":"Khoo","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Takufumi","family":"Yanagisawa","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Toshiki","family":"Yoshimine","sequence":"additional","affiliation":[{"name":"Endowed Research Department of Clinical Neuroengineering, Global Center for Medical Engineering and Informatics, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Haruhiko","family":"Kishima","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]},{"given":"Masayuki","family":"Hirata","sequence":"additional","affiliation":[{"name":"Department of Neurological Diagnosis and Restoration, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"},{"name":"Endowed Research Department of Clinical Neuroengineering, Global Center for Medical Engineering and Informatics, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"},{"name":"Department of Neurosurgery, Graduate School of Medicine, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan"}]}],"member":"219","published-online":{"date-parts":[[2020,9,16]]},"reference":[{"issue":"1","key":"S0129065720500562BIB001","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1111\/nyas.13135","volume":"1380","author":"Cabib C.","year":"2016","journal-title":"Ann. 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