Effects of repeated doses of caffeine on performance and alertness: new data and secondary analyses

The effects of caffeine on mood and performance are well established. Some authors suggest that caffeine merely reverses effects of caffeine withdrawal rather than having direct behavioural effects. It has also been suggested that withdrawal may be removed by a first dose of caffeine and further doses have little subsequent effect. These issues are examined here.The present study aimed to determine whether caffeine withdrawal influenced mood and...