The training of the human child dep

The training of the human child depends largely on a system of rewards and punishments, and this suggests that it ought to be possible to carry through the organizing with only two interfering inputs, one for "pleasure'” or "reward”(R) and the other for "pain" or“punishment" (P). One can devise a large number of such“pleasure-pain" systems……Pleasure interference has a tendency to fix the character,i.e, towards preventing it changing, whereas pain stimuli tend to disrupt the character, causing features which had become fixed to change, or to become again subject to random variation.