The main part of the study was where they gave people cognitive tasks and made claims to the subjects about whether caffeine helped. The interaction of the caffeine and the claim was weird.
Yes, I think the caffeine always helped, but I think there was one combination where the effect of claim was larger than the effect of the caffeine. At that point, I become a bit nervous about the meaning of whether caffeine helps. (by “interaction,” I meant the interaction of effects on performance)
Did it? Surely they took that measure too...
Yes, I think the caffeine always helped, but I think there was one combination where the effect of claim was larger than the effect of the caffeine. At that point, I become a bit nervous about the meaning of whether caffeine helps.
(by “interaction,” I meant the interaction of effects on performance)