Iain Morley

饰：Self - lecturer in palaeoanthropology, University of Oxford

Sophie Scott

饰：Self - neuroscientist, University College London

Clifford Nass

饰：Self - professor of communication, Stanford University

David M. Howard

饰：Self - professor, University of York

Christine Kitamura

饰：Self - psychologist, University of New South Wales

Branka Zei Pollermann

饰：Self - psychologist, Vox Institute à Genève

Maho Kurashima

饰：Self - vocal coach

Anne Karpf

饰：Self - author of book 'The Human Voice'

Krzysztof Izdebski

饰：Self - founder and chairman, Pacific Voice and Speech Foundation

Hideyuki Sawada

饰：Self - professor, Faculty of Engineering, Kagawa University

Isobel Kirk

饰：Herself - executive voice director, Sydney

Jean Abitbol

饰：Himself, otorhinolaryngologist, Faculté de Médecine de Paris

Yoshio Matsumoto

饰：Himself, Service Robotics Research Group, National Institute of

安格丽克·基乔

Angélique Kidjo

饰：自己

Sherry Turkle

饰：Self - professor, Massachusetts Institute of Technology