later. If an individual is in a room with two strangers they are more likely to gravitate towards the person that they occasionally pass on the street, than the person that they have never seen before. An example of the use of mere exposure theory can be seen in product placements in movies and TV shows. We see a product that is in our favorite movie, and hence we are more inclined to buy that product when we see it again. Priming can fit into these categories; Semantic Priming, Visual Priming, Response Priming, Perceptual and Conceptual Priming, Positive and Negative Priming, Associative and Context Priming, and Olfactory Priming. Visual and Semantic priming is the most used in motivation. Most priming is linked with emotion, the stronger the emotion, the stronger the connection between memory and the stimuli. Priming also has an effect on drug users. In this case, it can be defined as, the reinstatement or increase in drug craving by a small dose of the drug or by stimuli associated with the drug. If a former drug user is in a place where they formerly did drugs, then they are tempted to do that same thing again even if they have been clean for years. Conscious Motivation Freud relied heavily upon the theories of unconscious motivation as explained above, but Allport (a researcher in 1967) looked heavily into the powers of conscious motivation and the effect it can have upon goals set for an individual. This is not to say that unconscious motivation should be ignored with this theory, but instead, it focuses on the thought that if we are aware of our surroundings and our goals, we can then actively and consciously take steps towards them. He also believed that there are three hierarchical tiers of personality traits that affect this motivation: Cardinal traits: Rare, but strongly determines a set behavior and can't be changed Central traits: Present around certain people, but can be hidden Secondary traits: Present in all people, but strongly reliant on context- can be altered as needed and would be the focus of a conscious motivation effort. Mental Fatigue Mental fatigue is being tired, exhausted, or not functioning effectively. Not wanting to proceed further with the current mental course of action is in contrast with physical fatigue, because in most cases no physical activity is done. This is best seen in the workplace or