Figure 2.

PES but not PCS is modulated by citalopram and 5-HTTLPR. A, PES is compared with PCS. We found a modulation by 5-HT only for slowing induced by errors but not conflict itself. Citalopram increased PES (p = 0.003), and SS subjects showed overall higher PES than did LL subjects (p = 0.029). PCS was numerically but nonsignificantly reduced by citalopram. B, Neither drug nor genotype effects were seen for the number of errors. Significance is marked for post hoc tests of drug effects within each genotype and between genotypes as follows: *p < 0.05, **p < 0.01, ^†p < 0.10, all other comparisons for PCS (A) and error numbers are nonsignificant (all p values >0.1). Error bars reflect SEM.