About the Authors
Graduate School of Frontier Sciences, The University of Tokyo, Complex Science and Engineering, Chiba, Japan
RIKEN Brain Science Institute, Wako, Japan
The authors have declared that no competing interests exist.
Conceived and designed the experiments: KT. Performed the experiments: KT. Analyzed the data: KT. Contributed reagents/materials/analysis tools: KT MO. Wrote the paper: KT MO.