medieval Persian physician and scientist, author of the fundamental work “The Canon of Medical Science”. He is also one of the founders of developmental psychology. Focusing on the problem of upbringing, he believed that adults form the character (“nature”) of a child by evoking various affects in the child. Ibn Sina tried to experimentally study the relationship between the psyche and physiology – he can also be considered the founder of psychosomatic medicine. Avicenna’s experiment was organized as follows: two rams were given the same food, but a wolf was tied next to one of them. Near the tied wolf, the ram quickly began to lose weight and eventually died. Avicenna considered life activity in the context of physiological changes occurring in various systems of the body. Ibn Sina distinguished five types of senses: hearing, sight, smell, touch and taste. According to the Arab scientist, sensory activity is transmitted through nerve endings, corresponding to the sense organs, and sensory transmission occurs along nerve endings due to the movement of vaporous particles. The characteristics of sensations are: duration, intensity and sensual tone.