Placebo effect

The human mind can significantly influence our physical state, leading to relaxation, tension, healing, or even recovery from illness through brain processes. This phenomenon is known as the placebo effect.

The placebo effect isn't about positive thinking. Often, people are unaware that they are being treated with "sugar pills" that have no medical effect. Patients believe they are receiving real treatment, and their minds trick them into experiencing therapeutic results.^[1]

Studies show that pills or capsules of warm, active colors (orange, red, or yellow) are thought to create a stimulating effect, while blue medicine tends to induce relaxation and tranquility.^[2]

The perceived qualities of colors can be used in design to show users that their expectations will be met. For example, using green for a Pay button can convey safety and reliability, suggesting the action is secure and trustworthy. Conversely, a red Pay button might evoke urgency or caution, which could be less reassuring for users in sensitive contexts.