Ibn Sina's view on the connection between the happiness of perceptions and the state of the human brain

Ibn Sina emphasizes the central role of "perception" in addressing issues related to the happiness of human perception. According to him, human perceptions, including sensory, imaginary and intellectual, seek happiness commensurate with themselves. Since the state of the brain has a direct effect on the way a person perceives, this happiness is also related to the state of the brain. In the present article, by descriptive-analytical method, the effect of brain health on perception and, consequently, the effect of happiness on it is examined and analyzed. According to the findings of this study, abnormal brain conditions in three cases of nature disorders, mood disorders and brain diseases, disrupt the natural process of perception. This disorder causes the perfection of various powers and as a result, the happiness resulting from that area, including the happiness resulting from the area of the intellect, which is the highest type of happiness, is disrupted. Considering the relationship between the state of the brain, which is often beyond the scope of the individual's will and control, and the human race's attempt to achieve happiness due to perceptions, the question arises as to how the happiness of people with brain abnormalities is achieved ? Reflecting on the works of Ibn Sina, two answers can be given to this question: the first answer is an empirical answer and observes the possibility of adjusting the brain in worldly life, and the second