ABSTRACT
Charles Darwin, who was himself prone to depression, published The Expression of the Emotions in Animals and Man in 1872, 13 years after Origin of Species. 1 , 2 This was the first large-scale attempt by a scientist to demonstrate that certain universals might exist in human emotional expression. Darwin wanted to support his theory of evolution - that we had all evolved from a common progenitor - by showing not only that certain emotional expressions were universal, and therefore had a common genetic blueprint, but also that there was some continuity between humans and other mammals in the way that we expressed moods. Some photographs of his observed expressions are shown in Figure 3.1.
