About the Authors

János Geier


Affiliation Stereo Vision Ltd., Budapest, Hungary

Mariann Hudák

Affiliations Faculty of Natural Sciences, Department of Cognitive Science, Budapest University of Technology and Economics, Budapest, Hungary, Hungarian Academy of Science-Budapest University of Technology and Economics Research Group of Cognitive Science, Budapest, Hungary

Competing Interests

This study was funded by Stereo Vision Ltd. through the directorship and 50% ownership of János Geier. There are no patents, products in development or marketed products to declare. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials, as detailed online in the guide for authors.

Author Contributions

Conceived and designed the experiments: JG MH. Performed the experiments: MH. Analyzed the data: MH. Contributed reagents/materials/analysis tools: JG MH. Wrote the paper: JG MH. Invented the effect: JG. Wrote the experimental program: JG. Wrote the supporting Flash demo: MH.