Definition of physiological. 1  1 : of or relating to physiology. 2  2 : characteristic of or appropriate to an organism's healthy or normal functioning the sodium level was physiological. 3  3 : differing in, involving, or affecting physiological factors a physiological strain of bacteria.
Motivated reasoning is confirmation bias taken to the next level. Motivated reasoning leads people to confirm what they already believe, while ignoring contrary data. But it also drives people to develop elaborate rationalizations to justify holding beliefs that logic and evidence have shown to be wrong.
Motivation is a theoretical construct used to explain behavior. It represents the reasons for people's actions, desires, and needs. Motivation can also be defined as one's direction to behavior or what causes a person to want to repeat a behavior and vice versa. A motive is what prompts the person to act in a certain way or at least develop an inclination for specific behavior.