About the Authors

Mark D. Humphries

m.d.humphries@sheffield.ac.uk

Affiliation Adaptive Behaviour Research Group, Department of Psychology, University of Sheffield, Sheffield, United Kingdom

Kevin Gurney

Affiliation Adaptive Behaviour Research Group, Department of Psychology, University of Sheffield, Sheffield, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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