斯蒂文·麦金托什

Steven Mackintosh

饰：Himself - Narrator

布赖恩·黑尔

Brian Hare

饰：Himself - Duke University

Morten Kringelbach

饰：Himself - University of Oxford

Greger Larson

饰：Himself - Durham University

Adam Miklosi

饰：Himself - Eötvös Loránd University

Lyudmila Trut

饰：Herself - Institute of Cytology and Genetics

Kerstin Uvnäs-Moberg

饰：Herself - Karolinska Institute