Arnot presents a new theory and explanation of the function of the frontal lobe. Based on clinical pre- and post-lobotomy studies, and psychological studies, compared with anatomical and physiological knowledge, Arnot offers the theory that the function of the frontal lobes is not a primary one but is to maintain or sustain emotional states, trains of association, motor actions, or the inhibition of such actions. Other previous theories, such as Goldstein's abstract thinking theory, do not contradict this but rather are usually specific applications of this broader persistence theory.