About the Authors
Laboratory for Neural Circuit Theory, RIKEN Brain Science Institute, Wako, Japan
Department of Computer Science, Ritsumeikan University, Shiga, Japan
The authors have declared that no competing interests exist.
Conceived and designed the experiments: KK TF. Performed the experiments: SK. Analyzed the data: SK. Contributed reagents/materials/analysis tools: SK KK. Wrote the paper: TF.