About the Authors

Matthias S. Keil

matskeil@ub.edu

Affiliations University of Barcelona, Faculty for Psychology, Basic Psychology Department, Barcelona, Spain, Research Institute for Brain, Cognition, and Behavior (IR3C), Campus Mundet, Barcelona, Spain

Joan López-Moliner

Affiliations University of Barcelona, Faculty for Psychology, Basic Psychology Department, Barcelona, Spain, Research Institute for Brain, Cognition, and Behavior (IR3C), Campus Mundet, Barcelona, Spain

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MSK JLM. Performed the experiments: MSK JLM. Analyzed the data: MSK. Contributed reagents/materials/analysis tools: MSK. Wrote the paper: MSK. Designed and performed the psychophysical experiment: JLM. Developed the model and performed mathematical analysis: MSK.