Sara Robinson is on the roll: Tunnels and Bridges, Part II: Nothing to Fear But Fear Itself
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Fear, that most primitive of emotions, is good, at least when it is kept under control. It is essential for survival, allowing an organism to detect a potential threat to its life.
The study of the influence of emotion on cognition and perception has really taken off over the last decade or so, which is a good thing, because cognitive psychologists pretty much ignored emotion for a long time, so we have some catching up to do.
Take a look at these two faces.