VISUAL EVENT-RELATED POTENTIAL (P300) A normative study

ABSTRACT- The P300 component of the Event-Related Potential (ERP) is a general measurement of “cog-nitive efficiency”. It is an index of the ability of an individual’s Central Nervous System (CNS) to process incoming information. Objective: To develop a normative database for the visual P300. Methodology: 30 right-handed individuals (same number of each sex), between 20 and 30 years of age, healthy, free of any cognitive impairment and not making use of psychoactive substances. Participants were submitted to a visual discrimination task, which employed the “oddball ” paradigm. Results: The expected scalp distri-bution trend was seen for latency but not for amplitude values. Conclusion: A high variability of laten-cy and amplitude values was observed across the age span. Mean reaction time for the entire sample of the study was 391.56 + 37.03 ms. KEY WORDS: event-related potential, P300. Potencial evocado visual relacionado a evento (P300): estudo normativo RESUMO- O componente P300 do Potencial Evocado Relacionado a Evento é uma medida geral de “efi-ciência cognitiva ” e um índice da qualidade do processamento e armazenamento de informações pelo sis