About the Authors
- Julia Fischer
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* E-mail: fischer@cog-ethol.de
Affiliation Cognitive Ethology Laboratory, German Primate Center, Göttingen, Germany
- Stuart Semple
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Affiliation Centre for Research in Evolutionary Anthropology, Roehampton University, London, United Kingdom
- Gisela Fickenscher
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Affiliation Cognitive Ethology Laboratory, German Primate Center, Göttingen, Germany
- Rebecca Jürgens
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Affiliation Cognitive Ethology Laboratory, German Primate Center, Göttingen, Germany
- Eberhard Kruse
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Affiliation Department of Phoniatrics and Pedaudiology, Georg-August Universität Göttingen, Göttingen, Germany
- Michael Heistermann
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Affiliation Reproductive Biology Unit, German Primate Center, Göttingen, Germany
- Ofer Amir
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Affiliation Department of Communication Disorders, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: JF SS OA. Performed the experiments: GF SS MH. Analyzed the data: JF SS. Wrote the paper: JF SS. Analysis of vowels: OA. Analysis of free speech: RJ. Performed the laryngoscopy: EK.