About the Authors

Johannes Friedrich
Walter Senn


Affiliation Department of Physiology and Center for Cognition, Learning and Memory, University of Bern, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JF WS. Performed the experiments: JF. Analyzed the data: JF WS. Wrote the paper: JF WS.