About the Authors

Katrien Beuls

Affiliation Artificial Intelligence Laboratory, Vrije Universiteit Brussel, Brussels, Belgium

Luc Steels

steels@arti.vub.ac.be

Affiliations ICREA - Institut de Biologia Evolutiva (UPF-CSIC), Barcelona, Spain, Sony Computer Science Laboratory, Paris, France

Competing Interests

One of the authors (L.S.) is associated with the Sony Computer Science Laboratory in Paris, which is a division of Sony Europe, Ltd, United Kingdom. The company adheres to all the PLOS ONE policies on sharing the data and materials that pertain to the research presented in the paper. Moreover there are no patents accepted nor submitted in relation to the reported work.

Author Contributions

Implementation: KB. Conceived and designed the experiments: LS KB. Performed the experiments: LS KB. Analyzed the data: LS KB. Contributed reagents/materials/analysis tools: LS KB. Wrote the paper: LS.