Does the shape or color of a pain pill influence its effectiveness?Although logically it shouldn't, whether we believe a drug will work does have a powerful effect on our perceptions (e.g., placebo effect).In this experiment, 4 groups of adult patients were given the same amount of Advil after dental surgery for pain relief, but the color and shape of the pill varied.Researchers hypothesized that an unusual shape or color would lead people to believe the pills were new and special and thus would expect them to be more effective than common round, white pills. Researchers also wanted to know if there is an interaction between shape and color