Table 3.
Mean (± SD) skin conductance responses to pictures (N = 52)
| Preceding cue type | |||
|---|---|---|---|
| Picture Valence | Certain | Uncertain | Combined |
| Aversive | .238 ± .114 | .267 ± .127 | .248 ± .112a |
| Neutral | .112 ± .080 | .129 ± .103 | .117 ± .075a |
| Combined | .175 ± .081 | .198 ± .097 | .183 ± .081 |
Note. All values are in units of µS. Skin conductance responses were square root-transformed prior to calculation of means.
a
Because each picture type occurred twice as frequently following the ‘Certain’ as opposed to the ‘Uncertain’ cue, marginal means for responses to Aversive and Neutral pictures are a weighted average of cell means (i.e., 2/3*Certain mean + 1/3*Uncertain mean).