Amphibians, reptiles, mammals -- all of them communicate via acoustic signals. And humans are able to assess the emotional value of these signals. This has been shown in a new study conducted by researchers at Vrije Universiteit Brussel and Ruhr-Universität Bochum, in collaboration with colleagues from Alberta, Canada, and Vienna, Austria, in the journal "Proceedings of the Royal Society B." They interpreted these findings as evidence that there might be a universal code for the vocal expression and perception of emotions in the animal kingdom. Previous studies had demonstrated that humans are capable of identifying emotions in the voices of different mammals. The new study results have been expanded to include amphibians and reptiles.
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