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タイトル: | Hierarchical Neural Representation of Dreamed Objects Revealed by Brain Decoding with Deep Neural Network Features |
著者: | Horikawa, Tomoyasu Kamitani, Yukiyasu https://orcid.org/0000-0002-9300-8268 (unconfirmed) |
著者名の別形: | 神谷, 之康 |
キーワード: | dream brain decoding deep neural networks hierarchical neural representations functional magnetic resonance imaging |
発行日: | 31-Jan-2017 |
出版者: | Frontiers Media SA |
誌名: | Frontiers in Computational Neuroscience |
巻: | 11 |
論文番号: | 4 |
抄録: | Dreaming is generally thought to be generated by spontaneous brain activity during sleep with patterns common to waking experience. This view is supported by a recent study demonstrating that dreamed objects can be predicted from brain activity during sleep using statistical decoders trained with stimulus-induced brain activity. However, it remains unclear whether and how visual image features associated with dreamed objects are represented in the brain. In this study, we used a deep neural network (DNN) model for object recognition as a proxy for hierarchical visual feature representation, and DNN features for dreamed objects were analyzed with brain decoding of fMRI data collected during dreaming. The decoders were first trained with stimulus-induced brain activity labeled with the feature values of the stimulus image from multiple DNN layers. The decoders were then used to decode DNN features from the dream fMRI data, and the decoded features were compared with the averaged features of each object category calculated from a large-scale image database. We found that the feature values decoded from the dream fMRI data positively correlated with those associated with dreamed object categories at mid- to high-level DNN layers. Using the decoded features, the dreamed object category could be identified at above-chance levels by matching them to the averaged features for candidate categories. The results suggest that dreaming recruits hierarchical visual feature representations associated with objects, which may support phenomenal aspects of dream experience. |
著作権等: | © 2017 Horikawa and Kamitani. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
URI: | http://hdl.handle.net/2433/218521 |
DOI(出版社版): | 10.3389/fncom.2017.00004 |
PubMed ID: | 28197089 |
出現コレクション: | 学術雑誌掲載論文等 |
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