Table 1.
Mean (± SEM) levels of performance to S1 and S2 during their first two (left columns) and final two (right columns) presentations in each stage of training across all experimentsa
| Experiment | Groups | Stage 1 | Stage 2 | |||||
|---|---|---|---|---|---|---|---|---|
| S2 |
S1 |
|||||||
| 1 | Vehicle | — | 21 (5) | 88 (4) | 29 (5) | 83 (7) | ||
| CHX | 20 (7) | 69 (8) | 21 (8) | 69 (9) | ||||
| S1 |
S2 |
S1 |
||||||
| 2a | Vehicle | 14 (7) | 60 (12) | 29 (6) | 73 (9) | 52 (13) | 63 (16) | |
| Pre-CHX | 9 (3) | 64 (11) | 43 (6) | 75 (9) | 51 (11) | 50 (14) | ||
| Post-CHX | 21 (7) | 73 (13) | 33 (12) | 53 (13) | 49 (12) | 44 (16) | ||
| S1 |
S2 |
S1 |
||||||
| 2b | Vehicle | 24 (5) | 83 (6) | 57 (8) | 82 (7) | 64 (9) | 62 (10) | |
| 5-AZA | 20 (5) | 71 (9) | 48 (5) | 76 (7) | 55 (9) | 58 (10) | ||
| Stage 1 | Stage 2 | Stage 3 | ||||||
| S1 |
S1 |
S2 |
S1 |
|||||
| 3 | Vehicle | 18 (4) | 71 (8) | 12 (3) | 38 (7) | 76 (6) | 55 (7) | 73 (8) |
| CHX | 23 (6) | 72 (10) | 10 (3) | 45 (6) | 78 (8) | 49 (10) | 69 (12) | |
| Stage 1 | Stage 2 | |||||||
| S1 |
S2 |
S1 |
||||||
| 4 | Vehicle | 7 (5) | 12 (6) | 41 (10) | 65 (10) | 42 (8) | 73 (8) | |
| CHX | 3 (2) | 8 (6) | 26 (7) | 55 (9) | 32 (8) | 67 (9) | ||
| S1 |
S2 |
S1 |
||||||
| 5 | Vehicle | 9 (2) | 19 (3) | 18 (5) | 59 (7) | 11 (4) | 59 (9) | |
| CHX | 9 (2) | 18 (2) | 13 (4) | 68 (8) | 9 (4) | 56 (9) | ||
aThe only exception is Stage 2 of Experiment 3, where the data reflect average performance to S1 throughout its eight presentations during the final extinction session on day 6. All values correspond to mean levels of freezing, except for Stage 1 of Experiment 5, in which the measure of learning and memory for the S1-sucrose association was rats' rate of magazine entries per minute.