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End-to-end deep image reconstruction from human brain activity

Guohua Shen, Kshitij Dwivedi, Kei Majima, Tomoyasu Horikawa, View ORCID ProfileYukiyasu Kamitani
doi: https://doi.org/10.1101/272518
Guohua Shen
1Computational Neuroscience Laboratories, ATR, Kyoto, Japan
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Kshitij Dwivedi
1Computational Neuroscience Laboratories, ATR, Kyoto, Japan
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Kei Majima
2Graduate School of Informatics, Kyoto University, Kyoto, Japan
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Tomoyasu Horikawa
1Computational Neuroscience Laboratories, ATR, Kyoto, Japan
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Yukiyasu Kamitani
1Computational Neuroscience Laboratories, ATR, Kyoto, Japan
2Graduate School of Informatics, Kyoto University, Kyoto, Japan
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  • ORCID record for Yukiyasu Kamitani
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Abstract

Deep neural networks (DNNs) have recently been applied successfully to brain decoding and image reconstruction from functional magnetic resonance imaging (fMRI) activity. However, direct training of a DNN with fMRI data is often avoided because the size of available data is thought to be insufficient to train a complex network with numerous parameters. Instead, a pre-trained DNN has served as a proxy for hierarchical visual representations, and fMRI data were used to decode individual DNN features of a stimulus image using a simple linear model, which were then passed to a reconstruction module. Here, we present our attempt to directly train a DNN model with fMRI data and the corresponding stimulus images to build an end-to-end reconstruction model. We trained a generative adversarial network with an additional loss term defined in a high-level feature space (feature loss) using up to 6,000 training data points (natural images and the fMRI responses). The trained deep generator network was tested on an independent dataset, directly producing a reconstructed image given an fMRI pattern as the input. The reconstructions obtained from the proposed method showed resemblance with both natural and artificial test stimuli. The accuracy increased as a function of the training data size, though not outperforming the decoded feature-based method with the available data size. Ablation analyses indicated that the feature loss played a critical role to achieve accurate reconstruction. Our results suggest a potential for the end-to-end framework to learn a direct mapping between brain activity and perception given even larger datasets.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted February 27, 2018.
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End-to-end deep image reconstruction from human brain activity
Guohua Shen, Kshitij Dwivedi, Kei Majima, Tomoyasu Horikawa, Yukiyasu Kamitani
bioRxiv 272518; doi: https://doi.org/10.1101/272518
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End-to-end deep image reconstruction from human brain activity
Guohua Shen, Kshitij Dwivedi, Kei Majima, Tomoyasu Horikawa, Yukiyasu Kamitani
bioRxiv 272518; doi: https://doi.org/10.1101/272518

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