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 theory, a cornerstone of social psychology, delineates the psychological discomfort arising when an individual simultaneously harbors two or more conflicting beliefs, values, or attitudes.
2. This inherent unpleasant sensation, termed 'dissonance', serves as a potent psychological motivator, impelling individuals to engage in various strategies aimed at restoring cognitive equilibrium.
3. Common resolution mechanisms include the alteration of a conflicting attitude, the rationalization of an inconsistent behavior, or the selective re-evaluation of the perceived importance of the discordant cognitions.
4. The famous Festinger and Carlsmith experiment, involving trivial tasks and differential payment for deception, dramatically demonstrated how individuals would internalize new beliefs to justify their counter-attitudinal actions.
5. Despite its widespread acceptance, some critiques contend that the theory overlooks the significant role of self-perception processes in attitude change, positing that behavior can precede and thus inform internal states rather than merely reduce dissonance.