Results of particular investigations presented in the publication were achieved within a more broadly oriented research project focused on factors affecting the dynamics of educability in children and pupils in need of special educational supportive measures - i.e. with special educational needs. The text incorporates conclusions from the pilot project research, results of comparative investigations in the dynamics of development of visual, auditive and intermodal functions in pre-school children and intact pupils of the first and the second years of primary school, and standards for selected basal function sub-tests for pupils in the second year of primary school (seven- / eight-year-olds).