A low- dose of caffeine suppresses EEG alpha power and improves working memory in healthy University males

•Drinking a low- dose of caffeine could alter cortical activity after 30-min ingestion by suppressing resting EEG alpha power with eyes closed.•An inverse correlation between the diminishment in resting alpha activity and improvement of working memory following a 50 mg dose of caffeine supports the stimulant effects of low-dose caffeine as a morning wake-up drink in young adults.