In the given article results of cognitive function of patients with involution psychoses according to research data of event-related evoked potentials (EREP) are highlighted. It is shown that EREP characteristics (latent period of peaks and their amplitude, including P300) of examined patients of different ages do not have significant differences from normative indications of reference group. Some slight differences between researched and reference groups the author interprets as some readiness of functional brain structures of patients from research group for development of cognitive deficit which is not related to organic changes.
