His horror of being alone was paralleled by her dread of having him out of her sight. She was continually thinking, and talking, of risks he would incur if he were allowed to be by himself. In this way she had unconsciously infected him with a "fixed idea" that something dreadful was sure to happen to him unless older persons were at hand to protect him. This fixed idea preying on his unusually impressionable mind, and keeping him in a constant state of emotional strain, was the decisive factor in the production of his day terrors. In proof whereof it need only be added that his hallucinations and general nervousness ceased to trouble him soon after corrective training was begun, supplemented by treatment by "suggestion" to rid him of the abnormal fear of being alone. Fortunately, though I might detail a number of other cases of day terrors, this affliction is of rare occurrence, compared with night terrors. And, from the point of view of the medical psychologist, it is only to be expected that such should be the case. As explained by Doctor Williams, in a passage which gives a clear idea of the mechanism of night terrors: "If I say to a small boy that a bear will eat him up, the effect upon his emotions entirely differs, whether I make the remark with portentous gravity and horror, or whether I say it with bubbling joviality as, evidently, a huge joke. In the first eventuality, the boy will rush to my side in terror and try to be saved from the bear, and a phobia is in course of construction; with the latter proceeding, the boy will laugh consumedly, and it would not take much to make him enter the cage and strike the bear. But, even when terrified, a child feels a refuge in the protection of his elders during the day, when they are rarely absent.... "At night, however, the child is alone, and his little consciousness cannot find the support of others. Before the kaleidoscope of his dreams pass the various images and accompanying emotions of his waking life, so that if any of these images has become linked with fear it is certain to bring with it terror, as it surges into dream in the night, and the child jumps up, awakened, in panic, finding no one near, upon whom to lean."[17]