The paper is focused on the investigation of impact of created experimental natural scientific programme for preschool-age children. Our programme concentrates on physics teaching adapted for preschool age in which children have possibilities to make experiments themselves—empirical cognition. Its innovation with respect to other stimulation programmes implemented in the past consists of including connection and thus developing a wide spectrum of intellectual abilities. Primarily, we are focusing on the impact of stimulation programme research on selected psychological variables, specifically intellectual abilities—intellectual maturity. Its second aim is to compare and test the validity of drawing tests designed for intellectual-level investigation of preschool-age children, school maturity, and school readiness. The obtained results do not provide evidence in support of the stimulation programme on developing intellectual/conceptual maturity. The results of the second part of the research (i.e., drawing) shows that the indicative level of intellect, perception, and motor maturity are closely related.
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