1. Acquisition curve of Eyeblink CR

2. Extinction curve

3. Spontaneous Recovery
(New day)
(New day)
(New day)

4. Generalization Gradient
From Moore, 1972
Eyeblink conditioning in Rabbits
CS+ = 1200 Hz Tone UCS = mild Shock Hundreds of trials
Generalization test in extinction (no US)

5. Second-Order or Higher-Order Conditioning
From Rizley & Rescorla, 1972
Phase 1: (8 Trials) CS1 (flashing light) → UCS (shock)
CR: Fear (CER - conditioned emotional response)
Phase 2: CS2 (1800 Hz tone) → CS1 (light)

6. Latent Inhibition From Hall & Minor, 1984 CER Procedure:
Phase 1: Train thirsty rats to drink from tube
Phase 2: Separately present Tone during 3 Sessions; Controls had no Tone while in box
Phase 3: All rats had Tone Shock pairings
Test Phase: Present Tone while rats were drinking from water tube
Suppression ratio = _A_
A+B
A = # responses during CS
B = # responses prior to CS (same amount of time)
The lower, the more suppression