1. Eysenck (e.g. 1957) suggests that we inherit proneness to through the ANS, or learn it as conditioned fear.

2. Barlow (e.g. 1991) places and at the centre of emotional disorder. He argues that it is difficult to distinguish between anxiety and depression.

3. A basic assumption made by most current theorists is that emotion is fundamentally i.e. it is functional from an evolutionary viewpoint.

4. In The Expression of the Emotions in Man and Animals, Charles Darwin (1872) argued that the facial expressions of humans are innate, that they are therefore the same in all cultures around the world, and that they are modified from the emotional expressions of

5. has been the acknowledged expert on the expression and recognition of emotion from the early 1960s to the present.