Table 1. Genetic influences on reaction times and reaction time variability (± standard deviation).
| Reaction time | RTSD1 | |
| DAT1 | ||
| 6R–10R/6R–10R (N = 79) | 353±63 ms | 91±28 ms |
| at least one non-6R–10R allele (“DAT 1 other”; N = 95) | 353±56 ms | 89±31 ms |
| COMT | ||
| Met/Met (N = 35) | 359±65 ms | 89±31 ms |
| Val/Met (N = 96) | 349±60 ms | 89±29 ms |
| Val/Val (N = 43) | 359±53 ms | 92±30 ms |
| DAT1×COMT | ||
| 6R–10R/6R–10R+Met/Met (N = 15) | 346±52 ms | 90±26 ms |
| 6R–10R/6R–10R+Val/Met (N = 46) | 354±66 ms | 91±26 ms |
| 6R–10R/6R–10R+Val/Val (N = 18) | 359±68 ms | 91±36 ms |
| DAT1 other+Met/Met (N = 20) | 369±73 ms | 89±35 ms |
| DAT1 other+Val/Met (N = 50) | 344±54 ms | 87±32 ms |
| DAT1 other+Val/Val (N = 25) | 358±41 ms | 93±26 ms |
1
RTSD = intraindividual standard deviation of reaction times (reaction time variability).