Experimental procedure
| Group | CS conditioning (12 × 120 trials) | Compound conditioning (70 trials) | Probe trials (30 alternating CS-no reward) | Test (105 min) |
|---|---|---|---|---|
| Light | Light + reward | Light/tone + reward | Light, tone, Light, tone, Light, tone, … | Light/tone + reward |
| Tone | Tone + reward | |||
| Both | Light/tone + reward |