Table 5.
All main and significant interaction effects including the between-subject factor VIGILANCE as well as the results of post hoc testing for significant effects including this factor for six ERP components
| ERP component | VIGILANCE: main effect | VIGILANCE: significant interaction effects | Results of post hoc tests for significant interaction effects including the factor VIGILANCE |
|---|---|---|---|
| P100 | F(1;104)=0.039; P=0.845 | VIGILANCE × EMOTION × GRID: F(3;312)=2.904; P=0.035 | For “grid” trials in LPV subjects: all emotion categories lower potentials compared to neutral (all P-values <0.05) |
| EPN | F(1;104)=4.329; P=0.040 | VIGILANCE × CONTEXT: F(2;104)=3.16; P=0.046 | In the control condition lower potentials for HPV vs LPV subjects (P=0.024) |
| P200 | F(1;104)=1.944; P=0.166 | all F’s <1 | – |
| P300 | F(1;104)=0.108; P=0.743 | VIGILANCE × ELECTRODE × GRID: F(2;208)=3.397; P=0.046 | For LPV subjects at Pz and Cz: higher potentials in “grid” compared with “no grid” trials (both P-values <0.01) |
| Early LPC | F(1;104)=0.932; P=0.336 | VIGILANCE × CONTEXT × GRID: F(2;104)=3.261; P=0.042 | In the control condition for “grid” trials: higher potentials for HPV compared with LPV subjects (P=0.041) |
| VIGILANCE × CONTEXT × ELECTRODE: F(4;208)=3.066; P=0.027 | In the control condition at Fz: higher potentials for HPV compared with LPV subjects (P=0.002) | ||
| VIGILANCE × ELECTRODE × GRID: F(2;208)=4.128; P=0.031 | For LPV subjects at Pz and Cz: higher potentials in “grid” compared with “no-grid” trials (both P-values <0.01) | ||
| Late LPC | F(1;104)=0.121; P=0.729 | all F’s <1 | – |
Note: As for P200 and late LPC no significant interactive effects for VIGILANCE were found, no post-hoc testing for this factor was performed.
Abbreviations: EPN, early posterior negativity; ERP, event-related brain potential; LPC, late positive complex; LPV, low pain vigilant; HPV, high pain vigilant.