[Ethology of panic disorders]

Animal's world is perfectly coded. According to genetical equipment, there are in natural sphere, signals whose bio-physical structure releases panics behaviours. But the mere fact that an organism is developing from birth to death makes it sensitive to different informations. Imprinting allows to young to incorporate another live-being or a sphere, category it. From now, if we change this sphere, it's a trouble of relation of world which panics the young. Surpopulation regarded in an animal world as an impossibility to classify its world, impairs animal's behaviours and released accidental panics. Overgenerational appears soon in animals, a long time before words. But when human language appears, it modifies memory's nature and allows therefore troubles released by a representation. The tranquilizing mechanism often consists of changing fear in anxiety, easier to manage.