Table 2.
The eigenvector matrices of the principal component analysis including 16 impulsivity variables in all participants
| Component |
|||||
|---|---|---|---|---|---|
| Inattention | Impulsive reward-seeking | Response slowing | Impulsive responding | Anxious responding | |
| Per cent variance (cumulative variance), % | 27 (27) | 14 (41) | 12 (52) | 10 (62) | 8 (71) |
| BIS-11 attention | 0.41 | 0.54 | 0.05 | −0.47 | 0.21 |
| BIS-11 motor | 0.43 | 0.57 | 0.02 | −0.39 | 0.03 |
| BIS-11 non-planning | 0.49 | 0.29 | −0.19 | −0.56 | 0.24 |
| BIS score (BIS/BAS) | 0.20 | 0.13 | 0.05 | 0.03 | 0.65 |
| BAS drive | 0.16 | 0.63 | 0.03 | 0.48 | −0.29 |
| BAS fun-seeking | 0.19 | 0.80 | −0.10 | 0.11 | −0.16 |
| BAS reward responsiveness | 0.09 | 0.63 | 0.02 | 0.58 | −0.03 |
| RVIP A′ (response accuracy) | −0.82 | 0.23 | 0.49 | −0.14 | −0.01 |
| RVIP B′′ (response bias) | 0.32 | −0.14 | −0.01 | −0.33 | −0.42 |
| RVIP mean RT correct responses | 0.45 | −0.10 | −0.13 | 0.26 | −0.18 |
| RVIP commission errors | −0.02 | −0.07 | −0.11 | 0.45 | 0.69 |
| RVIP omission errors | 0.82 | −0.22 | −0.48 | 0.10 | −0.05 |
| RVIP correct responses | −0.82 | 0.22 | 0.48 | −0.11 | 0.05 |
| Stop-Signal mean successful go-RT | 0.65 | −0.19 | 0.62 | 0.00 | −0.01 |
| Stop-Signal mean unsuccessful stop-RT | 0.67 | −0.19 | 0.60 | 0.07 | 0.04 |
| Stop-Signal reaction time | 0.63 | −0.06 | 0.45 | 0.13 | 0.17 |
| Stop-Signal post-stop-RT | 0.47 | −0.06 | 0.49 | 0.12 | −0.20 |
Component loadings of ≥0.5 were considered significant and are given in bold.
BIS-11 = Barratt Impulsiveness Scale; BIS/BAS = Behavioural Inhibition/Activation System scale; RT = reaction time.