Irrational Decision The somatic marker hypothesis in psychology (Antonio Damasio, 1994, 1998) suggests that even when human is doing what appears to be "rational decisions”, he still use emotions and feelings in decision making process. When a person evaluates an object or an experience, he is actually imaging the feeling which the associated consequences will bring to him. Depending on these “emotional” feelings, then people can make “Rational "decision. From the physiological structure point of view，the Ventromedial Pre-frontal Cortex (VMPF) is associated with the perception of a part of emotions. Patients with impaired VMPF have normal intelligence but can not feel or express certain emotions. A study found that these patients also had difficulty in making decisions in their daily lives, which shows that the emergence of human decision-making is accompanied by emotions, is supported by emotions, is an irrational process.