Prof G:

How do I go about "persuading" you that the chart above is all wrong?

Humans generally do not "think" in the rational, deliberate way ascribed to them by the chart. That "model" of human behavior is highly inaccurate.

There are "specialists" in the art of persuasion. They live in Hollywood. They live on Madison Avenue. They live on K Street. They do not reside in the academic ivory towers (no offense, I really like professors --it's just that "persuation" of the masses is not within their bag of tricks).

Just last night, I saw a new Hummer ad campaign rolling out across my TV. A polite mother is waiting on line at the park by the slide for her 4 year old to get his turn. A more aggressive Mom cuts in line with her kid. "Hey, that's not fair." says the meek, polite Mom. Then she goes out and buys a Hummer. She is sick and tired of getting pushed around. She is out on the road pushing her weight around. Who's the big Momma now? Ha.

Do you "think" this ad campaign is going to sell Hummers? Stop being a meek, polite academic here. Tell us your true emotional reaction to this ad. Damn right this ad is going to work! No one is going to push me around anymore. I'm mad as hell and not going to take it anymore! (--I think?)

The Hummer ad you've outlined is actually a perfect use of a low-interest appeal using peripheral cues: it corresponds very well to one side of the theory.

Alternately, a high-interest appeal using central processing: the classic print ads for the VW bug in the 1960's, explaining that it was so different it was smart to own.

Petty and Cacciopo's main point? Different mindsets need different approaches. They would not disagree with you.