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Elaboration likelihood model
The Elaboration Likelihood Model (ELM) of persuasion 〔Petty R. and Cacioppo J. "Communication and persuasion: central and peripheral routes to attitude change." Springer-Verlag, New York.〕 is a dual process theory describing the change of attitudes form. The ELM was developed by Richard E. Petty and John Cacioppo in the mid-1970s.〔 The model aims to explain different ways of processing stimuli, why they are used, and their outcomes on attitude change. The ELM proposes two major routes to persuasion: the central route and the peripheral route. Under the central route, persuasion will likely result from a person's careful and thoughtful consideration of the true merits of the information presented in support of an advocacy. The central route involves a high level of message elaboration in which a great amount of cognition about the arguments are generated by the individual receiving the message. The results of attitude change will be relatively enduring, resistant, and predictive of behavior. On the other hand, under the peripheral route, persuasion results from a person's association with positive or negative cues in the stimulus or making a simple inference about the merits of the advocated position. The cues received by the individual under the peripheral route are generally unrelated to the logical quality of the stimulus. These cues will involve factors such as the credibility or attractiveness of the sources of the message, or the production quality of the message. The likelihood of elaboration will be determined by an individual's motivation and ability to evaluate the argument being presented.
==Origin of the Elaboration Likelihood Model==
Elaboration Likelihood Model is a general theory of attitude change. According to the theory’s developers Richard E. Petty and John T. Cacioppo, they intended to provide a general “framework for organizing, categorizing, and understanding the basic processes underlying the effectiveness of persuasive communications”.
The study of attitudes and persuasion began as the central focus of social psychology, featured in the work of psychologists Gordon Allport (1935) and Edward Alsworth Ross (1908). Allport described attitudes as “the most distinctive and indispensable concept in contemporary social psychology”. Considerable research was devoted to the study of attitudes and persuasion from the 1930s through the late 1970s. These studies embarked on various relevant issues regarding attitudes and persuasion, such as the consistency between attitudes and behaviors and the processes underlying attitude/behavior correspondence. However, Petty and Cacioppo noticed a major problem facing attitude and persuasion researchers to the effect that there was minimal agreement regarding “if, when, and how the traditional source, message, recipient, and channel variables affected attitude change”. Noticing this problem, Petty and Cacioppo developed the Elaboration Likelihood Model as their attempt to account for the differential persistence of communication-induced attitude change. Petty and Cacioppo suggested that different empirical findings and theories on attitude persistence could be viewed as stressing one of two routes to persuasion which they presented in their Elaboration Likelihood Model.
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