Table 1.
Evoked potentials and emotion ratings as a function of picture category.
| Neutral pictures |
Pleasant pictures |
Unpleasant pictures |
ANOVA |
||||||
|---|---|---|---|---|---|---|---|---|---|
| M | SD | M | SD | M | SD | F (2, 93) | p | η2 | |
| Amplitude | |||||||||
| N2 (μV) | −16.21 | 9.29 | −15.39 n | 9.26 | −13.62 np | 8.86 | 14.63 | .001 | .24 |
| P2 (μV) | 21.69 | 10.72 | 20.75 n | 10.66 | 19.14 np | 10.26 | 11.44 | .001 | .20 |
| LPP (μV) | 10.69 | 6.23 | 12.01n | 7.26 | 15.51 np | 6.54 | 36.21 | .001 | .44 |
| Latency | |||||||||
| N2 (ms) | 128.62 | 17.76 | 129.38 | 16.95 | 127.08 | 17.58 | 3.20 | .05 | .06 |
| P2 (ms) | 255.53 | 30.21 | 256.09 | 31.00 | 249.49 np | 30.20 | 1.02 | .36 | .02 |
| Ratings | |||||||||
| Valence | 5.26 | 0.68 | 7.15 n | 0.66 | 2.46 np | 0.68 | 1022.37 | .001 | .96 |
| Arousal | 4.33 | 0.88 | 6.42 n | 0.85 | 6.16 n | 1.20 | 216.31 | .001 | .82 |
Note: Letters n and p denote significant (p < 0.05) differences from the neutral and pleasant categories, respectively.