Borisenko Natalya A. RussiaMoscow Psychological Institute of Russian Academy of Education, 125009, Moscow, Mokhovaya St., 9, building 4. ведущий научный сотрудниккандидат филологических наукborisenko_natalya@list.ru Author's articles Behavior of adolescents in the digital educational environment: Definition of concepts and formulation of the problem