Before the attempt to change their minds, half the participants were given moderate doses of caffeine, while the other half took a placebo. Both groups were double-blinded so that neither the researchers nor the participants knew who had taken what. Then they were given six stories to read which argued against euthanasia。
When asked afterwards for their attitude to voluntary euthanasia, those who had drunk caffeine were more influenced by the persuasive message than those who'd had the placebo。
But why? What is it about caffeine that opens us up to persuasion?
The reason that a lot of persuasive messages pass us by is simply that we're often not paying much attention to them; our minds easily wander and we prefer not to think too hard unless it's unavoidable。