The physiological beginnings of an emotion typically occur before a person is consciously aware of the feeling itself. For example, when people who fear snakes are shown pictures of snakes, sensors on their skin will detect sweat breaking out, a sign of anxiety, though they say they do not feel any fear. The sweat shows up in such people even when the picture of a snake is presented so rapidly that they have no conscious idea of what, exactly, they just saw, let alone that they are beginning to get anxious. As such preconscious emotional stirrings continue to build, they eventually become
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