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Effects of caffeine on EEfRT. Left panel shows percent of high effort choices at low, medium and high probability of reward by drug condition as means +/− SE. Although effortful choice increased with increasing probability of reward, drug had no significant effect on choice. Right panel shows psychomotor speed in key presses per second, as estimated marginal means from LME model +/− SE of drug effect. Caffeine significantly increased key pressing speed.
