It is a deficiency in mental development in general or in certain components in it, It is characterized by disturbances in the frequency and timing of the development of various aspects of the mentality. V. Lebedinsky identified 6 different types of mental insufficiency: 1) Underdevelopment. 2) Growth retardation. 3) Damaged growth. 4) Growth deficit. 5) deformed growth; and 6) inharmonious growth. An example of a backward type of mental dysphoria is intellectual disability. The type of late development is characterized by a slowdown in the pace of formation of cognitive and emotional fields, With installation in early ages. Besides the functions of the deficit, There are also reserved jobs (see Growth Retardation). Damaged development differs from late development by late pathological influence (after 2-3 years) in the brain. An example of damaged development is positive dementia. Growth deficit is associated with underdevelopment or damage to certain sensory organs: Such as vision, hearing, speech, musculoskeletal system, and a number of physical diseases that lead to disability. Deformed development is characterized by a complex combination of general underdevelopment, delay, damage and acceleration of the development of certain psychological functions. A characteristic model is the development of autism spectrum syndrome in early childhood. The basis of disharmonious development is the congenital or early-acquired stable disparity of the mind, Especially in the voluntary emotional sphere. Models of this type of development can be a number of psychopaths and so-called pathological personality formations.