About the Authors

Linus Holm

Linus.Holm@psy.umu.se

Affiliation Department of Psychology, University of Umeå, Umeå, Sweden

Stephen Engel

Affiliation Department of Psychology, University of Minnesota, Minneapolis, Minnesota, United States of America

Paul Schrater

Affiliations Department of Psychology, University of Minnesota, Minneapolis, Minnesota, United States of America, Department of Computer Science, University of Minnesota, Minneapolis, Minnesota, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LH SE. Performed the experiments: LH. Analyzed the data: LH PS. Contributed reagents/materials/analysis tools: LH PS. Wrote the paper: LH SE PS. Derived ideal observer: PS. Designed analysis software/implemented ideal observer: PS LH.