This function of inhibition, then, delays, retards or prevents an action and is in one sense a higher function than the response to stimulation. Its main seat is the cerebrum, the "highest" nervous tissue, whereas reflex and instinctive actions usually are in the vegetative nervous system, the spinal cord, the bulbar regions and the mid-brain, all of which are lower centers. Choice, which is intimately associated with inhibition, is par excellence a cerebral function and in general is associated with intense consciousness. The act of choosing brings to the circumstances the whole past history of the individual; it marshals his resources of judgment, intelligence, will, purposes and desires. In choice lies the fate of the personality, for it is basically related to habit formation. Further, in the dynamics of life a right, proper choice, an appropriate choice, opens wide the door of opportunity, whereas an unfortunate choice may commit one to the mercies of wrecking forces. Education should aim to teach proper choosing and then proper action. The capacity for perceiving and responding to stimuli, for inhibiting or delaying action and for choosing, are of cardinal importance in our study. But there is another phase of life and character without which everything else lacks unity and is unintelligible. From the beginning of life to the end there is choice. Who and what chooses? From infancy one sees the war of purposes and desires and the gradual rise of one purpose or set of purposes into dominance,--in short, the growth of unity, the growth of personality. The common man calls this unity his soul, the philosopher speaks of the ego and implies some such thing as this organizing energy of character. But a naturalistic view of character must reject such a metaphysical entity, for one sees the organizing energy increase and diminish with the rest of character through health, age, environment, etc. Further, there is at work in all living things a similar something that organizes the action of the humblest bit of protoplasm. This organizing energy of character will be, for us, that something inherent in all life which tends to individualize each living thing. It is as if all life were originally of one piece and then, spreading itself throughout the world, it tended to differentiate and develop (according to the Spencerian formula) into genera, species, groups and individuals. This organizing energy works up the experiences of the individual so that new formulae for action develop, so that what is experienced becomes the basis of future reaction.