Table 1 Levels of baseline (pre-CS) percent freezing across testing phases
From: Temporal factors in the extinction of fear in inbred mouse strains differing in extinction efficacy
|  |  |  S1 |  |  | B6 |  |
|---|---|---|---|---|---|---|
Varying conditioning-extinction training interval | Â | Â | Â | |||
| Â | Cond | Extinction | Retrieval | Cond | Extinction | Retrieval |
Immediate | 0.0 ±0.0 | 15.1 ±22.0 | 10.2 ±15.7 | 0.0 ±0.0 | 16.1 ±23.3 | 5.0 ±3.1 |
Delayed | 0.0 ±0.0 | 6.4 ±10.3 | 10.9 ±13.5 | 0.0 ±0.0 | 2.8 ±3.9 | 2.2 ±3.2 |
Varying interval between extinction cues (3-shock cond) | Â | Â | Â | |||
| Â | Cond | Extinction | Retrieval | Cond | Extinction | Retrieval |
Spaced | 0.0 ±0.0 | 0.7 ±1.3 | 2.1 ±2.0 | 0.2 ±0.8 | 4.7 ±3.5 | 3.0 ±2.6 |
10-trial massed | 0.0 ±0.0 | 4.6 ±3.2 | 2.6 ±1.9 | 0.4 ±1.1 | 5.7 ±3.6 | 3.2 ±3.8 |
50-trial massed | 0.0 ±0.0 | 1.7 ±2.5 | 3.5 ±3.6 | 0.0 ±0.0 | 2.4 ±2.3 | 1.7 ±2.5 |
Varying interval between extinction cues (1-shock cond) | Â | Â | Â | |||
| Â | Cond | Extinction | Retrieval | Cond | Extinction | Retrieval |
Spaced | 0.0 ±0.0 | 1.2 ±2.9 | 3.0 ±3.6 | 0.0 ±0.0 | 2.3 ±3.3 | 3.0 ±2.6 |
Massed | 0.0 ±0.0 | 0.5 ±1.2 | 2.0 ±2.4 | 0.0 ±0.0 | 4.4 ±3.0 | 1.2 ±3.2 |
Single-CS exposure prior to extinction training | Â | Â | Â | |||
| Â | Cond | Extinction | Test | Cond | Extinction | Test |
CS | 0.0 ±0.0 | 9.2 ±9.1 | 29.4 ±18.9 | 0.0 ±0.0 | 11.1 ±17.5 | 33.9 ±22.9 |
No CS | 0.0 ±0.0 | 19.4 ±18.2 | 35.6 ±19.9 | 0.0 ±0.0 | 5.6 ±13.9 | 18.6 ±16.9 |
Extinction of a second-order conditioned cue | Â | Â | Â | |||
| Â | Cond | Extinction | Retrieval | 2nd Cond | Extinction | Retrieval |
CS2 x CS1 | 0.4 ±0.7 | 0.0 ±0.0 | 0.0 ±0.0 | 0.1 ±0.4 | 0.0 ±0.0 | 0.0 ±0.0 |
CS2 only | 0.4 ±0.9 | 0.0 ±0.0 | 0.0 ±0.0 | 0.0 ±0.0 | 0.0 ±0.0 | 0.0 ±0.0 |