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Design of Experiment 2
| Group | Phase 1 | Phase 2 | Test |
|---|---|---|---|
| Elem-NDeg | X→O (10) | O→US (8) | X |
| Ov-NDeg | AX→O (10) | O→US (8) | X |
| Elem-Deg | X→O (10)/O (20) | O→US (8) | X |
| Ov-Deg | AX→O (10)/O (20) | O→US (8) | X |
Note. Numbers in parentheses next to the pairings indicate total number of trials in that phase. → = “followed by”; X = click train; A = tone; O = white noise; US = foot shock; Elem = elemental; Ov = overshadowing (compound training); Deg = degraded contingency; NDeg = no degraded contingency.
