About the Authors
Department of Computer Science, University of Bristol, Bristol, Avon, United Kingdom
Department of Experimental Psychology, University of Bristol, Avon, United Kingdom
Department of Computer Science, University of Bristol, Bristol, Avon, United Kingdom,
The corresponding author's (FMM) PhD is being partly funded by British Telecom but they have had no input or influence upon the direction of the research and have imposed no restrictions upon the publication of any research findings. This does not alter the authors‚ adherence to all the PLOS ONE policies on sharing data and materials.
Conceived and designed the experiments: FMM RB NC. Performed the experiments: FMM. Analyzed the data: FMM RB. Contributed reagents/materials/analysis tools: RB NC. Wrote the paper: FMM RB.