SciELO - Scientific Electronic Library Online

vol.62 número2BEfeitos da galantamina sobre a memória e a atenção na doença de Alzheimer medidos por testes neuropsicológicos computadorizados: resultados do Estudo Multicêntrico com Galantamina (GAL-BRA-01)Plasmaférese no tratamento da miastenia grave: estudo retrospectivo de 26 pacientes índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados




Links relacionados


Arquivos de Neuro-Psiquiatria

versão impressa ISSN 0004-282Xversão On-line ISSN 1678-4227


DESLANDES, Andréa Camaz et al. Effects of caffeine on visual evoked potencial (P300) and neuromotor performance. Arq. Neuro-Psiquiatr. [online]. 2004, vol.62, n.2b, pp.385-390. ISSN 0004-282X.

The stimulant effects of caffeine on cognitive performance have been widely investigated. The visual evoked potential, specially the P300 component, has been used in studies that explain the stimulant mechanisms of caffeine through neurophysiological methods. In this context, the present study aimed to investigate electrophysiological changes (P300 latency) and modification of cognitive and motor performance produced by caffeine. Fifteen healthy volunteers, 9 women and 6 men (26 ± 5 years, 67 ± 12.5kg) were submitted three times to the following procedure: electroencefalographic recording, Word Color Stroop Test, and visual discrimination task. Subjects took a gelatin caffeine capsule (400 mg) or a placebo (P1 and P2), in a randomized, crossover, double-blind design. A one-factor ANOVA and Tukey’ post hoc test were used to compare dependent variables on the C, P1 and P2 moments. The statistical analyses indicated a non-significant decrease in reaction time, Stroop execution time and latency at Cz on the caffeine moment when compared to the others. Moreover, a non-significant increase in Stroop raw score and latency at Pz could be observed. The only significant result was found at Fz. These findings suggest that the positive tendency of caffeine to improve cognitive performance is probably associated with changes in the frontal cortex, a widely recognized attention area.

Palavras-chave : P300; caffeine; neuromotor performance.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )


Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons