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Supplemental Information

Figure 1: General setup of learning and test sessions.

Three potential reward locations were positioned in a semi-circle in the test area. E = experimenter, x = hidden food reward

DOI: 10.7287/peerj.preprints.281v1/supp-1

Table 1: Data on individual choice behavior

Scores in bold are significantly above chance level (P < 0.05)

DOI: 10.7287/peerj.preprints.281v1/supp-2

Additional Information

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Christian Nawroth conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables.

Eberhard von Borell conceived and designed the experiments, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Procedures and housing of experimental animals on our University Research Centre in Merbitz were licensed under the veterinary board order Nr. 152650330021. Housing facilities met the German welfare requirements for farm animals.


The study was internally funded from resources of the graduate program of Martin-Luther-University Halle-Wittenberg. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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