Question

theoretical model that posits two channels by which persuasive appeals lead to attitude change
cognitive dissonance theory
social schema
elaboration likelihood model (elm)
contact hypothesis
social validation

Explanation:

The Elaboration Likelihood Model (ELM) in Social Science (Psychology sub - field) posits two routes (central and peripheral) for attitude change through persuasive appeals. Cognitive dissonance theory is about psychological discomfort from conflicting beliefs. Social schema is a mental framework for social info. Contact hypothesis is about reducing prejudice through inter - group contact. Social validation is about seeking approval.

Answer:

elaboration likelihood model (ELM)