About the Authors

Ruth S. Sonnweber

Contributed equally to this work with: Ruth S. Sonnweber, Nina Stobbe

ruth-sophie.sonnweber@univie.ac.at

Affiliations Department of Cognitive Biology, University of Vienna, Vienna, Austria, Department of Behavioural Biology, University of Vienna, Vienna, Austria

Nina Stobbe

Contributed equally to this work with: Ruth S. Sonnweber, Nina Stobbe

Affiliation Department of Cognitive Biology, University of Vienna, Vienna, Austria

Olmo Zavala Romero

Affiliation Department of Scientific Computing, Florida State University, Tallahassee, Florida

Dennis E. Slice

Affiliations Department of Scientific Computing, Florida State University, Tallahassee, Florida, Department of Anthropology, University of Vienna, Vienna, Austria

Martin Fieder

Affiliation Department of Anthropology, University of Vienna, Vienna, Austria

Bernard Wallner

Affiliation Department of Anthropology, University of Vienna, Vienna, Austria

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RSS DES MF BW. Performed the experiments: RSS. Analyzed the data: RSS NS OZR. Contributed reagents/materials/analysis tools: RSS OZR DES. Wrote the paper: RSS NS OZR DES. Had the idea of using a photometric approach: MF. Established Photomodeler as an appropriate tool: BW MF.