Figure 2.

Delayed test results for recollection of neutral items. a, Significant quadratic correlation (indicated by the dashed inverted U-shaped line) between the weight-adjusted dose of l-DOPA and corrected remember hits for neutral items at delayed test. b, Corrected remember hits on l-DOPA minus placebo for participants divided into three groups based on the amount of l-DOPA they received. Performance was significantly different between all three groups, and better recollection on l-DOPA than placebo (indicated by performance above the dashed line) was seen for participants receiving the middle dose (average of 2 mg/kg). Bars represent mean ± 1 SEM. *p < 0.05, two tailed.