Cerebellar locomotion paper

We are very pleased to announce that our new paper, although written in Japanese, on bipedal locomotion by a musculoskeletal model under control of a cerebellar model is published.

Daisuke Ichimura, Satoshi Yano, Tadashi Yamazaki. Computer simulation of a cerebellar-musculoskeletal model for bipedal locomotion with feedback compensation of foot contact. IEICE Transactions on Information and Systems (Japanese Edition) Vol.J100-D No.8 pp.808-816, 2017.

Comment on our cat-scale artificial cerebellum paper

I am pleased to announce that the paper is now published online. I would like to thank all the people concerned on this paper.

The impact factor of this journal is 1.081, which is clearly lower than major neuroscience journals, and the paper does not necessarily add new insights on the cerebellar computation. Nevertheless, this paper is very precious for me by the following two reasons:

  1. This is perhaps the first neuroscience paper published in a real HPC journal.
  2. This is realized by a collaboration between neuroscience and HPC researchers.

On #1, several neuroscience/HPC papers have been published including a large-scale simulation on K computer (Kunkel et al. 2014) and our realtime cerebellum on a GPU (Yamazaki, Igarashi 2013), but these are published in technical journals of neuroscience such as Frontiers in Neuroinformatics and Neural Networks. The reason would be that the authors focused more on the value for neuroscience rather than for HPC. I would not think, however, that they show sufficient expertise and strength appropriate for technical HPC journals. This paper is written in the standard HPC language such as scaling, cache hierarchy, hiding communication, parallel reduction, which must be unfarmiliar to the most neuroscience researchers, and has demonstrated the strength for publication in an HPC journal. In this sense, this paper is very meaningful for me.

On #2, it was my great honour to write the paper with Professors Ebisuzaki and Makino, the two top of the GRAPE Project. Many scientists say “interdisciplinary research is important”, but it is **extremely** difficult to start such interdisciplinary research, because it takes so much time and effort to learn how to talk in the collaborators’ language. Very fortunately, the two professors were positive to speak our language, while Dr. Igarashi and I studied the HPC language very hard, and eventually we were able to talk each other in the same language. I would like to thank the accelerator workshop organized by Professor Ebisuzaki, where I had the chance to use Shoubu. Without the workshop, and without Dr. Igarashi who introduced me to the workshop, this paper was impossible. This is the victory of the team.

The milestone so far in my career was Yamazaki et al. (2015), and the present paper is a new milestone. When I started to use Suiren in the early summer of 2015, I did not expect that I could publish the paper on this unpresedented supercomputer so early.

The next milestone will be the realtime simulation of a human-scale cerebellar model composed of 100 billion neurons in spring 2018. Stay tuned.


New Paper!

(3/18 Update) Source code is now open!

(3/3 Update) The paper is published!

We are very pleased to announce that our new paper entitled “Real-world-time simulation of memory consolidation in a large-scale cerebellar model” written by Gosui and Yamazaki is accepted for publication in Frontiers in Neuroanatomy, Research Topic “Anatomy and plasticity in large-scale brain models”!

In this paper, we conducted computer simulation of 1 week OKR adaptation in our cerebellar spiking network model with 1 million neurons using 4 GPUs. We demonstrated that the 1 week simulation completed within 1 week in the real-world time. We will release the source code of the simulation program. More details will come soon.

New research paper on plasiticty of molecular-layer interneurons

We are very pleased to announce that Dr. William Lennon, who did a JSPS summer internship in my lab, published a new paper on parallel fiber-molecular layer interneuron plasticity. Congratulations, Bill!

Lennon W, Yamazaki T and Hecht-Nielsen R (2015). A Model of In Vitro Plasticity at the Parallel Fiber – Molecular Layer Interneuron Synapses. Front. Comput. Neurosci. 9:150. doi: 10.3389/fncom.2015.00150

PNAS article

After a long journey, the article on memory transfer is finally published in PNAS!

Tadashi Yamazaki, Soichi Nagao, William Lennon, Shigeru Tanaka. Modeling memory consolidation during posttraining periods in cerebellovestibular learning. Proceeding of the National Academy of Sciences of the United States of America, 112(11): 3541-3546, 2015.

We also publish a press release from the university.

PR: Practice makes perfect: a theoretical model of memory consolidation in the cerebellum

This is an open access article so that anyone can read it freely. I struggled to make the article, particularly the model equations, as simple as possible. So, if you feel that this article is easy to read, I am very happy with this.

As usual, the source code of the model program is uploaded on Cerebellar Platform under CC-BY license. Please use freely if you are interested in it.

Book Chapter

It is my privilege to write a book chapter with Dr. Masao Ito.

  1. Masao Ito, Kazuhiko Yamaguchi, Soichi Nagao, Tadashi Yamazaki. Long-Term Depression as a Model of Cerebellar Plasticity. Progress in Brain Research, 210:1-30, 2014.

Consensus Paper

Our concensus paper entitled “Consensus Paper: The Cerebellum’s Role in Movement and Cognition”, in which Yamazaki was invited as one of co-authors, was finally published online.

Leonard F. Koziol, Deborah Budding, Nancy Andreasen, Stefano D’Arrigo, Sara Bulgheroni, Hiroshi Imamizu, Masao Ito, Mario Manto, Cherie Marvel, Krystal Parker, Giovanni Pezzulo, Narender Ramnani, Daria Riva, Jeremy Schmahmann, Larry Vandervert, Tadashi Yamazaki. Consensus Paper: The Cerebellum’s Role in Movement and Cognition. The Cerebellum, In Press.