About the Authors
- Patricia Kanngiesser
- School of Experimental Psychology, University of Bristol, Bristol, United Kingdom
- Felix Warneken
- Department of Psychology, Harvard University, Cambridge, Massachusetts, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: PK FW. Performed the experiments: PK. Analyzed the data: PK FW. Wrote the paper: PK FW.