The Persuasive Effect of Circadian Arousal, Endorser Expertise, and Argument Strength in Advertising

Abstract

This research investigates the influence of circadian arousal, endorser expertise, and argument strength of a message on attitudes toward the brand and purchase intention. The quasi-experimental design is a 2 (high versus low endorser expertise) × 2 (strong versus weak arguments) × 2 (morning-type versus evening-type persons) × 3 (advertisement viewing time: 10 a.m., 3 p.m., or 8 p.m.) between-subjects factorial design with 602 Thai female adults. The results are not in complete accordance with predictions from the Elaboration Likelihood Model. For both types of persons, higher argument strength leads to better attitudes toward the brand and higher purchase intention, regardless of endorser expertise and advertisement viewing time. When morning-type persons view the advertisements in the morning and evening, the high- and the low-expertise endorsers have no different effect on attitudes toward the brand, regardless of argument strength. When they view the advertisements in the afternoon, the high expertise endorser creates better attitudes toward the brand than does the low expertise endorser, regardless of argument strength. For evening-type persons, endorser expertise does not affect either of the dependent variables. Theoretical and managerial implications of the study are discussed.