a trend toward significancep = 0.060
The standardized coefficient of the pendency (β) of the linear model showed a trend toward significance [β = −0.612, t(1,8) = −2.187 p = 0.060] for the drug group in APM scores of the low difficulty level ( Figure 2 , diamonds). β was statistically significant for the placebo group (β = −0.598, t(1,11) = −2.472 p = 0.031] when studied for the same APM category (low difficulty; Figure 2 , diamonds).