About the Authors

James V. Stone


Affiliation Psychology Department, Sheffield University, Sheffield, United Kingdom

Peter E. Jupp

Affiliation School of Mathematics and Statistics, University of St Andrews, St Andrews, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JS. Performed the experiments: JS. Analyzed the data: JS. Contributed reagents/materials/analysis tools: JS. Wrote the paper: JS PEJ. Mathematical proofs: PEJ.