Fig. 2.

Methamphetamine speeds up reaction times in women only. a Across all trial types and both drug conditions, men respond faster than women. However, MA significantly reduces reaction times in women. b When trial types are broken down by magnitude, high-incentive trials elicit the fastest reaction times as compared with low or no-incentive trials. Again, MA reduced reaction times in women only. N = 73 (44 men, 29 women). PBO, placebo; MA, methamphetamine. Lines represent mean reaction times, and error bars indicate standard error of the mean