For the initial moment of the movement, Thorndike, in contrast to Watson, did not take the external impulse, which causes the body of the experimental to move, but a problem situation that causes the body to adapt to the conditions of the surrounding reality and build a new formula for behavioral response. According to the scientist, unlike the reflex, the connection between the concepts "situation-reaction" could be characterized by such signs:
- the starting point is the problem situation;
- in response, the body tries to resist it as a whole;
- he is actively seeking an appropriate line of conduct;
- and is learned by new methods of exercise.