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Two experiments with 96 undergraduates tested the hypothesis that high issue involvement enhances thinking about the content of a persuasive communication. Exp I varied involvement and the direction of a message (pro-or counterattitudinal). Increasing involvement enhanced persuasion for the proattitudinal but reduced persuasion for the counterattitudinal advocacy. Exp II again varied involvement, but both messages took a counterattitudinal position. One message employed compelling arguments and elicited primarily favorable thoughts, whereas the other employed weak arguments and elicited primarily counterarguments. Increasing involvement enhanced persuasion for the strong message but reduced persuasion for the weak one. Together the experiments provide support for the view that high involvement with an issue enhances message processing and therefore can result in either increased or …