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buzzed, B&W
An Australian research team recently wrote a paper entitled Caffeine, cognition and persuasion: Further evidence for caffeine increasing the systematic processing of persuasive messages. I read about this first on ABC Australia.

I haven't read the 37 page research paper in detail, but their conclusion is interesting. ABC of course sensationalized it a bit, with the title Coffee makes us say 'yes'. The researchers mainly say that this study further supports the idea that moderate caffeine increases "central route processing" but they don't go so far as to say that there's cause and effect between increased central route processing and persuasion. In fact, they point out that the difference could be due to the mood enhancing effects of caffeine, as people in good moods tend to be more agreeable (and therefore easier to persuade).