The article examines the relationship between the frequency of children's use of information technologies and their cognitive functions. Today, virtual environments and information technologies offer extensive opportunities for social activity, education, and leisure. These technologies significantly impact not only the lives of adults but also the development of children. The article provides a review of current research on the influence of information technologies on the cognitive development of children and adolescents, analyzing key usage scenarios such as watching videos and playing computer games. The impact of information technologies on children's cognitive functions varies significantly depending on the type of information, the child's age, and the social context. The aim of the article is to study the impact of information technology use on children's cognitive functions. We investigated the frequency of information technology use and cognitive functions in children aged 11–12 using a survey, the Stroop test, the Wechsler Memory Scale (WISC-IV), and the Rey Auditory Verbal Learning Test (RAVLT). The results of the study revealed a direct impact of the level of information technology use on children's cognitive functions.