Masafumi Oizumi (大泉匡史)

Manager
Araya Inc. Advanced Technology Department 
Research & Development Group
Toranomon 15 Mori Building, 2-8-10 Toranomon
Minato-ku Tokyo, 105-0001, Japan

Visiting Researcher
RIKEN, Brain Science Institute
Behavioral Neurophysiology Lab.
2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan

E-mail: oizumi atmark araya.org
Last updated: May 8, 2018

Publications

23. Shun-ichi Amari, Naotsugu Tsuchiya, Masafumi Oizumi
Geometry of Information Integration.

22. Shohei Hidaka, Masafumi Oizumi
Fast and exact search for the partition with minimal information loss

21. Jun Kitazono, Ryota Kanai, Masafumi Oizumi
Efficient Algorithms for Searching the Minimum Information Partition in Integrated Information Theory
Entropy, 20(3), 173, 2018.

20. Shun-ichi Amari, Ryo Karakida, Masafumi Oizumi
Information Geometry Connecting Wasserstein Distance and Kullback-Leibler Divergence via the Entropy-Relaxed Transportation Problem
Information Geometry, 1(1), 1-25, 2018. 

19. Andrew M. Haun, Masafumi Oizumi, Christopher K Kovach, Hiroto Kawasaki, Hiroyuki Oya, Matthew A Howard, Ralph Adolphs, Naotsugu Tsuchiya
Contents of Consciousness Investigated as Integrated Information in Direct Human Brain Recordings
eNeuro, ENEURO-0085-17, 2017. 

18. Masafumi Oizumi, Naotsugu Tsuchiya, Shun-ichi Amari
Unified Framework for Information Integration Based on Information Geometry
Proceedings of the National Academy of Sciences, 113(51), 14817-14822, 2016.
press release (in Japanese),  blog (in English)

17. Masafumi Oizumi, Shun-ichi Amari, Toru Yanagawa, Naotaka Fujii, Naotsugu Tsuchiya
Measuring Integrated Information from the Decoding Perspective
PLoS Comput Biol, 12(1), e1004654, 2016.

16. Melanie Boly, Shuntaro Sasai, Olivia Gosseries, Masafumi Oizumi, Adenauer Casali, Marcello Massimini, Giulio Tononi
Stimulus Set Meaningfulness and Neurophysiological Differentiation: A Functional Magnetic Resonance Imaging Study. 
PLoS ONE, 10(5): e0125337, 2015. 

15. Masafumi Oizumi#, Larissa Albantakis#, Giulio Tononi
From the Phenomenology to the Mechanisms of Consciousness: Integrated Information Theory 3.0. 
PLoS Computational Biology, 10, e1003588, 2014. 
#Equal contribution

14. Akinori Mitani, Ryo Sasaki, Masafumi Oizumi, Takanori Uka
A leaky-integrator model as a control mechanism underlying flexible decision making during task switching. 
PLoS ONE, 8, e59670, 2013. 

13. Masafumi Oizumi, Ryota Satoh, Hokto Kazama, Masato Okada
Functional differences between global pre- and postsynaptic inhibition in the Drosophila olfactory circuit.
Frontiers in Computational Neuroscience, 6:14, 2012. 

12. Yasuhiko Igarashi, Masafumi Oizumi, Masato Okada
Theory of correlation in a network with synaptic depression. 
Physical Review E 85, 016108, 2012.

11. Yosuke Otsubo, Kenji Nagata, Masafumi Oizumi, and Masato Okada
Influence of synaptic depression on memory storage capacity. 
Journal of the Physical Society of Japan, 80, 084004, 2011.

10. Masafumi Oizumi, Masato Okada, Shun-ichi Amari
Information loss associated with imperfect observation and mismatched decoding. 
Frontiers in Computational Neuroscience, 5:9, 2011.

9. Yosuke Otsubo, Kenji Nagata, Masafumi Oizumi, Masato Okada
Instabilities in associative memory model with synaptic depression and switching phenomena among attractors.
Journal of the Physical Society of Japan, 79, 084002, 2010. 

8. Yasuhiko Igarashi, Masafumi Oizumi, Masato Okada
Mean field analysis of stochastic neural network models with synaptic depression. 
Journal of the Physical Society of Japan, 79, 084001, 2010. 

7. Ryota Satoh#, Masafumi Oizumi#, Hokto Kazama, Masato Okada
Mechanisms of maximum information preservation in the Drosophila antennal lobe. 
PLoS ONE, 5, e10644, 2010. 
#Equal contribution

6. Masafumi Oizumi, Keiji Miura, Masato Okada
Analytical investigation of the effects of lateral connections on the accuracy of population coding. 
Physical Review E, 81, 051905, 2010. 

5. Masafumi Oizumi, Toshiyuki Ishii, Kazuya Ishibashi, Toshihiko Hosoya, Masato Okada 
Mismatched decoding in the brain. 
The Journal of Neuroscience, 30, 4815-4826, 2010. 
*Featured in This Week In The Journal. 

4. Yasuhiko Igarashi, Masafumi Oizumi, Yosuke Otsubo, Kenji Nagata, Masato Okada
Statistical mechanics of attractor neural network models with synaptic depression. 
Journal of Physics Conference Series, 197, 012018, 2009. 

3. Masafumi Oizumi, Toshiyuki Ishii, Kazuya Ishibashi, Toshihiko Hosoya, Masato Okada 
A general framework for investigating how far the decoding process in the brain can be simplified.
Advances in Neural Information Processing Systems, 21, 1225-1232, 2009. 

2. Masafumi Oizumi, Yoichi Miyawaki, Masato Okada
Rate reduction for associative memory model in Hodgkin-Huxley-type network.
Journal of the Physical Society of Japan, 77(6), 064802, 2008.

1. Masafumi Oizumi, Yoichi Miyawaki, Masato Okada
Higher order effects on rate reduction for networks of Hodgkin-Huxley neurons.
Journal of the Physical Society of Japan, 76(4), 044803, 2007.

Publications in Japanese

2. Masafumi Oizumi
Integrated information theory of consciousness.
Clinical Neuroscience, 32(8), 905-912, 2014. 

1. Masafumi Oizumi, Naotsugu Tsuchiya
"Does a thermometer have consciousness?" -- theory and practice towards development of a consciousness meter. 
LiSA, 19(4), 352-359, 2012. 

Education

2001-2005 B.S. Department of Physics, The University of Tokyo
2005-2007 M.S. Department of Complexity Science and Engineering, The University of Tokyo (Prof Masato Okada's Lab)
2007-2010 Ph.D. Department of Complexity Science and Engineering, The University of Tokyo (Prof Masato Okada's Lab)

Work History

Mar, 2017 - present, Manager
Araya Inc., Advanced Technology Department, Research & Development Group.

Mar, 2017 - present, Visiting Researcher
RIKEN, Brain Science Institute, Behavioral Neurophysiology Lab.

Sep, 2014 - Dec, 2014 & Apr, 2015 - Oct 2016, Visiting Researcher
Monash University, Monash Biomedical Imaging, A/Prof Naotsugu Tsuchiya's Lab. 

Apr, 2014 - Feb, 2017, RIKEN Special Postdoctoral Researcher
RIKEN, Brain Science Institute, Prof Shun-ichi Amari's Lab.

Oct, 2011 - Oct, 2013, Visiting Researcher
University of Wisconsin - Madison, Prof Giulio Tononi's Lab.

Apr, 2011 - Mar, 2014, JSPS Superlative Postdoctoral Fellow (SPD) 
RIKEN, Brain Science Institute, Prof Shun-ichi Amari's Lab. 

Oct, 2010 - Mar, 2011, JSPS Postdoctoral Fellow (PD) 
RIKEN, Brain Science Institute, Prof Shun-ichi Amari's Lab. 

Grants and Fellowships
  • 2018-2022: Grant-in-Aid for Scientific Research (B), The Ministry of Education, Culture, Sports, Science and Technology (MEXT)
  • 2014-2017: Grant-in-Aid for Young Scientists (B), The Ministry of Education, Culture, Sports, Science and Technology (MEXT)
  • 2014-2017: RIKEN, Special Postdoctoral Researcher
  • 2011-2014: The Japan Society for the Promotion of Science (JSPS), Research Fellow SPD
  • 2008-2011: The Japan Society for the Promotion of Science (JSPS), Research Fellow DC1
Awards
  • Asican Pacific Neural Network Assembly Young Researcher Award 2012
  • Dean Prize, Graduate School of Frontier Sciences (Doctor Course) 2010
  • Japanese Neural Network Society Research Award 2008
  • Dean Prize, Graduate School of Frontier Sciences (Master Course) 2007
  • IEEE CIS Japan Chapter Young Researcher Award 2007
  • Japanese Neural Network Society Young Researcher Award 2006

Misc.
Essay about Prof. Giulio Tononi (in Japanese)
Clinical Neuroscience, 34(3), 372, 2016. 

Kanai-Tsuchiya Radio #2, ASSC in San Diego, July, 2013 (in Japanese) 

Kanai-Tsuchiya Radio #1, SfN in New Orleans, Oct, 2012 (in Japanese) 

Report about the lecture by Dr Masataka Watanabe in ASCONE 2010 (in Japanese)
On neural  mechanisms of consciousness.