placebo effect

(Newser) - Got a big day ahead? You're better off thinking you slept well, even if you didn't, a study suggests. Researchers told subjects a normal night of sleep consisted of about 20% to 25% REM sleep. Less than 20%, the subjects heard, meant a worse performance on cognitive tests,...

(Newser) - How effective a drug is has a lot to do with how effective you think it'll be, a new study suggests. Researchers gave 66 migraine sufferers a set of pills, some in envelopes labeled "Maxalt," a common migraine medicine, and others in envelopes labeled "placebo."...