The 1st author and his associates reported that the administration of moderate doses of caffeine hindered performance of introverts and helped performance of extraverts on a cognitive task similar to the verbal test of the Graduate Record Examination.
— The interactive effect of personality, time of day, and caffeine: A test of the arousal model.
Revelle, William; Humphreys, Michael S.; Simon, Lisa; Gilliland, Kirby
Journal of Experimental Psychology: General, Vol 109(1), Mar 1980, 1-31.
Revelle, William; Humphreys, Michael S.; Simon, Lisa; Gilliland, Kirby
Journal of Experimental Psychology: General, Vol 109(1), Mar 1980, 1-31.
