Time of assessment | Group 1—overlapping extinction trials | Group 2—alternating extinction trials | Group 3—successive extinction phases | Group 4—fear conditioning control | ||||
---|---|---|---|---|---|---|---|---|
CS+ | CS− | CS+ | CS− | CS+ | CS− | CS+ | CS− | |
Valence ratings (1, uncomfortable; 9, comfortable) | ||||||||
Prior acquisition | 5 (5–6) | 5 (5–7) | 5.5 (5–7) | 5.5 (5–7) | 5 (5–6.25) | 5 (5–7) | 5 (5–7) | 5 (5–7) |
Post-acquisition training | 3 (2.75–5)*† | 7 (6.75–8.25)*† | 3.5 (2–5)*† | 7.5 (6–9)*† | 4 (3–5)*† | 7 (6–8.25)*† | 4 (3–5)*† | 7 (6–8.25)*† |
Post-extinction training | 5 (3–7)* | 7 (5.75–7.25)*† | 5 (5–6.25)* | 7 (5–8)*† | 5 (5–7)* | 7 (5–8)*† | 5 (5–7)* | 6.5 (5–8)*† |
Arousal ratings (1, calm; 9, excited) | ||||||||
Prior acquisition | 3 (1–5) | 2.5 (1–5) | 3.5 (2–5) | 3 (2–5) | 3 (1–5) | 2.5 (1–5) | 3.5 (2–5) | 5 (1.75–5) |
Post-acquisition training | 5.5 (3.75–7)*† | 2 (1–3)*† | 5 (4.5–7)*† | 1.5 (1–3)*† | 6 (3–7)*† | 1 (1–3.25)*† | 5 (4.5–7)*† | 2 (1–4.25)*† |
Post-extinction training | 3.5 (2.75–6)* | 3 (1.75–3.25)*† | 4 (2–5)* | 2 (1–3)*† | 3 (1–5)* | 2 (1–5)*† | 4 (2–5)* | 2.5 (1–5)*† |
Self-reported median (IQR) valence and arousal ratings prior acquisition training, post-acquisition training and post-extinction training. Statistical significances (p < 0.5) are indicated in bold.
↵* Significant differences between pre-acquisition training and post-acquisition training.
† Significant differences between CS+ and CS− (least squares means tests, p < 0.05).