The more motile organisms are constantly, by very reason of their motility, encountering situations which put a strain upon the attention. The quest for food leads to encounters with members of their own and of different species; the resulting fight, pursuit, and flight are accompanied by the powerful emotions of anger and fear. The emotion is, as Darwin has pointed out, a part of the effort to reaccommodate, since it is a physiological preparation for action appropriate to the type of situation in question.[242] The strain upon the attention, the affective bodily condition, and the motor activity appear usually in the same connection, and, from the standpoint of biological design, the action concluding the series of bodily activities is of advantage to the organism. In animal life the situation is simple. Whether the animal decides to fight for it or to run for it, he has at any rate two plain courses before him, and the relation between his emotional states and the type of situation is rather definitely fixed racially, and relatively constant. Even in the associated life of animals the type of reaction is not much changed, and is here also instinctively fixed. But in mankind the instinctive life is overshadowed or rivaled by the freedom of initiative secured through an extraordinary development of the power of inhibition and of associative memory, while, at the same time, this freedom of choice is hindered and checked by the presence of others. The social life of mankind brings out a thousand situations unprovided for in the instincts and unanticipated in consciousness. In the midst, then, of a situation relatively new in race experience, where advantage is still the all-important consideration, and where this can no longer be secured either by fighting or running, but by the good opinion of one's fellows as well, we may look for some new strains upon the attention and some emotions not common to animal life.