The placebo effect operates on the domain of perception. In other words, placebo is a psychological effect, which may deceive a patient into perceiving that he

The placebo effect operates on the domain of perception. In other words, placebo is a psychological effect, which may deceive a patient into perceiving that he or she is getting better even though the sugar pills they just took had no physiological response from the body. Stress has a big psychological component, but it is also something that can be physilogically seen and can be measured. It's important to see the distinction between the psychological perception and the true physiology. Stress may not be the best example because as stated, stress has a lot to with the psychological state.