The National Agriculture and Food Research Organization (NARO) of Japan has demonstrated that viewing a flower image affects the brain activity and thereby induces psychological and physiological reaction, which supports recovery from psychological stress. The experiment put the subject group under a visual stress followed by showing a typical flower image which led to downregulation of negative emotions and a decrease in elevated blood pressure and cortisol levels. Through this research, the mechanism of viewing flowers to reduce human stress was explained scientifically using psychology, physiology and neuroimaging techniques.