highly significantp < 0.001
Importantly, the order of the sessions in which the participants received placebo and nicotine did not affect any of the measures, as all main effects of drug order and interactions between drug and drug order were non-significant, all F s < 1.45, all p s > 0.24. The correlations between nicotine and placebo conditions were moderate to large for all parameters and highly significant; thus, the reported changes appear to be very systematic: K , r (21) = 0.75, p < 0.001; C , r (21) = 0.84, p < 0.001; t 0 , r (21) = 0.57, p < 0.01; α , r (21) = 0.81, p < 0.001; w index , r (21) = 0.77, p < 0.001; error rate, r (21) = 0.64, p = 0.001, all corrected for age.