Table 1. Means and standard deviations of visual early contingent negative variation (CNV) amplitudes by DAT1 and COMT.

Separate effects of DAT1 and COMT	visual early CNVamplitude [µV]‘A’	visual early CNVamplitude [µV]‘X’	visual early CNVamplitude [µV]‘other’
DAT1 haplotype
6R–10R/6R–10R (N = 90)	−2.4±3.2 µV	−5.2±3.4 µV	−3.1±2.5 µV
Other (N = 105)	−1.7±2.3 µV	−4.6±2.8 µV	−2.6±2.0 µV
COMT
Met/Met (N = 45)	−2.7±3.2 µV	−5.0±3.1 µV	−3.2±2.6 µV
Val/Met (N = 107)	−2.1±2.6 µV	−5.0±3.0 µV	−2.9±2.3 µV
Val/Val (N = 43)	−1.2±2.7 µV	−4.4±3.3 µV	−2.4±1.9 µV
Combined effects of DAT1 and COMT
DAT1 10R–6R/10R-6R+COMT Met/Met (N = 20)	−3.8±3.8 µV	−5.7±3.7 µV	−4.1±3.0 µV
DAT1 other+COMT Met/Met (N = 25)	−1.8±2.3 µV	−4.3±2.4 µV	−2.5±2.1 µV
DAT1 10R-6R/10R-6R+COMT Val/Met (N = 53)	−2.3±2.9 µV	−5.3±3.4 µV	−2.9±2.5 µV
DAT1 other+COMT Val/Met (N = 54)	−1.8±2.2 µV	−4.7±2.6 µV	−2.8±2.1 µV
DAT1 10R-6R/10R-6R+COMT Val/Val (N = 17)	−1.2±2.9 µV	−4.1±2.9 µV	−2.4±1.9 µV
DAT1 other+COMT Val/Val (N = 26)	−1.3±2.6 µV	−4.6±3.6 µV	−2.5±1.9 µV