EN
The article presents the results of research on intellectual activity of primary school pupils participating in extracurricular activities, which were carried out under the program of the Ministry of Science and Higher Education entitled "Young Explorer's University". The research was carried out on specially organised classes in the form of non-formal education with a developed curriculum. The main research method was the diagnostic survey method, in which the technique was a questionnaire and the tool was a knowledge test. It was carried out using the Computer Assisted Personal Interview (CAPI) technique. In the article, most attention is paid to the change of intellectual activity in the context of pupils' cognitive processes in the adopted categories of tasks, i.e. memory, comprehension and use of information in typical and problematic situations, the concept of which was adopted on the basis of B. Niemierka's taxonomy.