ABSTRACT
In this chapter, the authors see how the fate of one individual is determined more by the objects of his interest, while in another it is determined more by his own inner self, by the subject. The names and concepts by which the mechanisms of extraversion and introversion have been grasped are extremely varied, and each of them is adapted to the standpoint of the observer in question. But despite the diversity of the formulations the fundamental idea common to them all constantly shines through: in one case an outward movement of interest towards the object, and in the other a movement of interest away from the object to the subject and his own psychological processes. The hypothesis of introversion and extraversion allows us to distinguish two large groups of psychological individuals.
