About the Authors
- Ulrike Griebel
- Institute for Intelligent Systems, The University of Memphis, Memphis, Tennessee, United States of America
- D. Kimbrough Oller
- School of Communication Sciences and Disorders, The University of Memphis, Memphis, Tennessee, United States of America
- Ulrike Griebel, D. Kimbrough Oller
- The Konrad Lorenz Institute for Evolution and Cognition Research, Altenberg, Austria
The authors have declared that no competing interests exist.
Conceived and designed the experiments: UG. Performed the experiments: UG DKO. Analyzed the data: UG DKO. Contributed reagents/materials/analysis tools: UG DKO. Wrote the paper: UG DKO.