These feelings are renewed ...

These feelings are renewed (at least the negative connotation of emotion) and of conditioned reflex reproduction of the pain reaction. Physical pain is also reproduced in the form of muscle spasms and other symptoms. For example, fear in young children can cause a loud sound. B. Watson and R. Rayner (Watson, Rayner, 1920), combining the display of white mice with a bang a gong, called a child due to fear of mice. It turned out that the extinction of fear after the termination of the unconditioned stimulus (loud sound) does not occur, in contrast to the classical conditioned reflex. Moreover, the fear had a tendency to generalize, that is spread on a rabbit, a white coat, a white sheet of paper, etc. Later, studying the nature of social fears, psychologists have come to similar results. Consider, as can be formed conditioned fear response in situations with downs. In real life, nothing is repeated in the same situation a few times. And the environment itself is changing. From birth, children are not afraid of heights, but when they begin to walk - a lot of falling. For example, once a child fell and felt pain as quickly ran after the cat, in another case, fell off the chair, and on the street - with swings for children. In each of these situations are always there was only one prearranged signal - loss of support. On it and produced a conditioned reflex or fear response. What kind of adaptive significance may be the fear of losing support (weightlessness), because the child does not realize that he ever lost his footing and did not foresee it in dangerous situations? That is because of transience, a very short duration of an accidental fall, fear of loss of support is not realized and, therefore, in reality, does not cause any conscious reactions. The answer to this question must be sought probably in dreams. Those associations that arise in each incident: loss of support and a cat, loss of support and chair, loss of support and swing - sooner or later deduce on the loss of support in the dream, so - on the topic of falls. Hence - the nightmares of falling. Sleep "reinforces" barely smoldering sense of danger to such an extent, to such a fear of falling, that the further stipulation, that is offset by prearranged signal heights and fear of heights (acrophobia), did not cause any problems. As an important adaptive significance of fear of heights to prevent falls. Perhaps, "reinforces the property of sleep is the cause of the extinction of the difficult social and other fears (phobias). Looking ahead, we note the hard coded key (in childhood) stories of dreams with the manifestations of gravity. The same fear of falls, falling objects, the fear of tight, enclosed spaces (claustrophobia) associated with the risk of collapse of the shelters - all testify to this. Not excluding, of course, and other fears (fear of darkness, loneliness, unfamiliar people, animals, etc.). In particular, the fear of strangers or animals may well be influenced by nightmares of persecution. The protective role of these fears, too obvious.