Regional glucose metabolism (µg/100 g/min) when subjects were tested during the neutral non-task with placebo (control condition), cognitive task with MP and cognitive task with placebo.

Data corresponds to mean and standard deviation. Subscripts correspond to paired t-test comparisons with respect to the control condition: ap<0.05, b p<0.01, c p<0.005, d p<0.001. The last column corresponds to the significance level for comparison between the cognitive task when given with MP or when given with placebo (PL).