Notes. OCI = sum score Obsessive Compulsive Inventory Revised; BIS = sum score Barratt Impulsiveness Scale; UPPS = UPPS Impulsive Behavior Scale.
Linear regression
Linear robust regression analyses yielded no significant effects of BIS-11 or OCI-R scores on the ERP amplitudes or behavioral performance (Table 3). For the UPPS scales, there was no influence on N2 and P3b amplitude, since the models with just the intercept had the smallest robust final prediction error. Models with the surviving regressors for the remaining response variables are reported in Table 4. Only the effect of the premeditation scale on the Nogo accuracy and IES showed significance after correction of the false discovery rate. Linear (pearson) correlations between behavioral and neural measures with questionnaire scores were also not observed (see supplementary table 1). Figure 1 depicts the EEG at frontocentral electrodes for participants with the highest and lowest 25% of OCI-R and BIS-11 scores, respectively .
Table 3. Linear regression models for BIS-11 and OCI-R scores