I found this to be a bit counterintuitive: "We conclude that in sum, the present study shows that pharmacological modification of complex cognitive performance

I found this to be a bit counterintuitive: "We conclude that in sum, the present study shows that pharmacological modification of complex cognitive performance in a highly demanding task is possible most likely by modifying decision making processes. More reflective decision making may enhance performance when no time limit for the task at hand is present but may have (emphasis mine) disadvantageous effects under time constraints especially in individuals who tend to be rather slow thinkers." Doesn't that mean stimulants are effectively useless for someone who tends to be a "slow thinker"? I would expect that stimulants would speed up the underlying decision making processes of a slow thinker, especially during times of stress/limited time constraints.