About the Authors

Michiko Koizumi

Affiliations Graduate School of Education, Hokkaido University, Sapporo, Japan, Japan Society for the Promotion of Science, Tokyo, Japan

Haruto Takagishi

takagishi@lab.tamagawa.ac.jp

Affiliation Tamagawa University Brain Science Institute, Tokyo, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MK. Performed the experiments: MK. Analyzed the data: MK HT. Contributed reagents/materials/analysis tools: MK. Wrote the paper: MK HT.