Psycholinguistics has three main theoretical sources. The first is the psychological direction in linguistics. Linguists of past centuries wrote that language has been an activity of the spirit and a reflection of the culture of the people. At the same time, they noted that language contains not only a physical, but also a mental component, and thus belongs to the individual. Being a condition of communication and regulating human activity, language limits the knowledge of the world and makes it impossible to fully understand another person.