The following five sentences, labeled 1 to 5, relate to a single topic. Four of these sentences can be arranged to form a logical paragraph. Identify the sentence that does not fit with the others and enter its number as your answer.

1. Cognitive dissonance, a foundational construct in social psychology, refers to the mental discomfort experienced when an individual simultaneously holds two or more conflicting beliefs, attitudes, or values, or when their behavior directly contradicts one of these established cognitions.
2. This unpleasant psychological tension, a core tenet of the theory, subsequently motivates individuals to seek a state of consistency, often achieved through altering one of the dissonant cognitions, changing the behavior, or rationalizing the disparity by adding new consonant beliefs.
3. The intensity of this dissonance is not merely a function of the quantity of conflicting elements, but critically depends on their personal salience and the perceived volitional choice one had in enacting the dissonant behavior.
4. Consequently, individuals might selectively expose themselves to information that supports their chosen actions, avoid contradictory evidence, or even downplay the importance of the conflicting cognitions to alleviate internal conflict.
5. Leon Festinger's groundbreaking 1957 publication of "A Theory of Cognitive Dissonance" revolutionized social psychology, challenging prevailing behaviorist paradigms by asserting the primacy of internal psychological consistency as a driver of attitude and behavior change.