Table 2. Summary of experimental design.
| Stage 1 (12) |
Stage 2 (6) |
Stage 3 (6) |
|
|---|---|---|---|
| A1B1+ | A1+ | B1+ | Backward blocking (violation) |
| A2B2+ | A2+ | B2− | Backward blocking (confirmation) |
| C1D1+ | C1− | D1+ | Unovershadowing (confirmation) |
| C2D2+ | C2− | D2− | Unovershadowing (violation) |
| I+ | I+ | I+ | Control for violation of backward blocking |
| J− | J− | J− | Control for violation of unovershadowing |
Note: Each letter represents a different food picture (counterbalanced across subjects), + indicates the presence of an allergic reaction, − indicates the absence of an allergic reaction. Numbers in parentheses indicate the number of repetitions of each trial type for that stage.