Fear is one of the six basic universal emotions (the others are anger, disgust, happiness, sadness and surprise) and like all human emotions not easy to understand. Fear can be played upon, enjoyed, conquered. It is an obstacle to progress ("the only thing to fear is fear itself") and, as we stand at the kerb, it saves our lives every day. This series of The Essay brings you five essays on different aspects of fear.

At first sight it appears that fear can be understood in a straightforward way as an adaptive response, promoting behaviour to protect us from threats to life and limb. In humans, however, the biological givens are invariably transformed and serve ends not envisaged in biology.

Physician and philosopher Raymond Tallis explores the uniqueness of human fear, how it is rooted in the distinctive nature of human as opposed to animal consciousness, and how it is often led by thought and imagination. He considers why, seemingly perversely, we might enjoy cultivating fear through stories and games.

Producer Laura Thomas.