Table 2.
Results of cognitive tasks
| Placebo mean (SE) | 0.2 mg mean (SE) | 0.5 mg mean (SE) | 1.0 mg mzean (SE) | ANOVA (main effect of dose) | |
|---|---|---|---|---|---|
| Stop signal task | |||||
| Go reaction time | 553.65 (18.76) | 572.38 (18.76) | 553.78 (18.80) | 578.8 (18.79) | F(3,42) = 2.96 p <.05 |
| Stop signal reaction time | 233.63 (12.) | 241.00 (12.0) | 238.96 (12.0) | 252.85 (12.0) | F(3,42) = 1.12 p = NS |
| Accuracy | 97.7 (.89) | 97.0 (.89) | 98.6 (.90) | 98.6 (.90) | F(3,42) = 0.78 p = NS |
| Recognition memory | |||||
| Total PR | 0.70 (.02) | 0.69 (.02) | 0.74 (.02) | 0.73 (.02) | F(3,42) = 2.19 p = NS |
| High PR | 0.74 (.02) | 0.71 (.02) | 0.73 (.02) | 0.76 (.02) | F(3,42) = 1.06 p = NS |
| Low PR | 0.57 (.03) | 0.58 (.03) | 0.67 (.03) | 0.61 (.03) | F(3,420) = 3.19 p <.05 |
| Total BR | 0.27 (.03) | 0.28 (.03) | 0.30 (.03) | 0.27 (.03) | F(3,42) = 0.30 p = NS |
| High BR | 0.37 (.03) | 0.36 (.03) | 0.36 (.03) | 0.37 (.03) | F(3,42) = 0.18 p = NS |
| Low BR | 0.30 (.04) | 0.33 (.04) | 0.37 (.04) | 0.29 (.04) | F(3,42) = 2.07 p = NS |
| Two-choice task | |||||
| # delayed choices | 18.00 (2.4) | 20.00 (2.4) | 14.22 (2.4) | 21.11 (2.4) | F[3,24) = 6.84 p <.01 |