[Disorders of cognitive activity in schizophrenics]

4 tests are exploring the cognitive activity of 3 groups of persons: normal, mental patients of various types, schizophrenics, homogeneous as far as the I.Q. is concerned (above 110) and education (secondary school, or university). Whereas normal and mental patients give identical results, except that they are worse for the latter, schizophrenics have better success than other patients in two tests of logic-mathematical reasoning and obviously worse in two tests of experimental logic. These results are interpreted in the frame of Piaget's theory as demonstrating the discordance of the very dynamics of schizophrenic thinking whose cognitive activity is at the same time too near to the object by adherence to the perceived structure (too concrete) and too far from it by adherence to formal reasoning schemes acquired under genetic development (too abstract). These results are coherent with clinical features showing that autistic thinking is not only discordant by its contents and its meaning, but also by the formal dynamic patterns of its modus operandi.