trial found that consuming coffee with caffeine had a direct effect on attention and alertness. (7)
Research also points to the fact that there may be an optimal amount of coffee that can improve cognitive function. For example, one study found that 200 mg of caffeine (about 2 cups of regular coffee) was most effective at affecting dopamine levels in the brain. Dopamine is connected with regulating attention and cognitive function. (8, 9)
One small study on 6 men and 6 women found that caffeine can help to overcome feelings
