Session differences in the magnitude of responding between age groups
| Interval | Session 1 | Session 2 | Session 3 | Session 4 | Session 5 | Session 6 | |
|---|---|---|---|---|---|---|---|
| P21–P23 vs P24–P26 | CS | 0 | 0 | 0 | 0 | 1 | 0 |
| Trace | 0 | 0 | 0 | 3 | 0 | 0 | |
| US | 18 | 7 | 5 | 1 | 5 | 1 | |
| P21–P23 vs P31–P33 | CS | 2 | 3 | 0 | 1 | 0 | 0 |
| Trace | 1 | 3 | 0 | 2 | 0 | 0 | |
| US | 9 | 5 | 5 | 1 | 3 | 2 | |
| P24–P26 vs P31–P33 | CS | 7 | 5 | 0 | 1 | 0 | 1 |
| Trace | 2 | 3 | 0 | 2 | 0 | 0 | |
| US | 13 | 5 | 8 | 5 | 1 | 0 |
The magnitude of responding was broken down by session and compared across age group (see Fig. 9). The number of bins that differed significantly between age groups for sessions 1–6 is depicted in columns. The age group and the trial interval (CS, trace, US) during which the significant bins occurred are depicted in rows. The majority of changes that occurred during the CS and trace intervals occurred during the first two sessions. The magnitude of responding during the US did not show any clear age- or session-related patterns.