While things like Parkinsons are easily explained medically by lack of dopamine, probably caused by environmental epigenetic effects like exposure to pesticides, other mental disorders lack a physiological basis. The theory of law integration disorder factors in the fight or flight response to coercion and explains these non-physiological mental illnesses as stress-induced phenomena. Movement: How can we move so controllably, even though the motor nerve impulses seem haphazard and unpredictable?[3] Computational theory of mind: What are the limits of understanding thinking as a form of computing?