Table 2.
LR and SR choices for control and stress high impulsive animals (HI) at each delay for LR (1 s, 10 s and 20 s) and across sessions during the delay discounting task (see Fig. 3).
| B-2 | B-1 | S1 | S2 | S3 | S4 | 1w | 2w | ||
|---|---|---|---|---|---|---|---|---|---|
| LR choices (%) | |||||||||
| 1 s | Control | 90.0 ± 6.1 | 80.0 ± 11.7 | 84.0 ± 11.5 | 66.0 ± 8.3 | 82.0 ± 12.4 | 82.0 ± 4.1 | 68.0 ± 11.4 | 78.0 ± 6.5 |
| Stress | 78.0 ± 5.4 | 94.0 ± 4.4 | 82.0 ± 7.4 | 90.0 ± 3.5* | 84.0 ± 8.3 | 76.0 ± 8.3 | 94.0 ± 2.7* | 100* | |
| 10 s | Control | 62.0 ± 8.9 | 36.0 ± 10.3 | 44.0 ± 18.2 | 42.0 ± 19.8 | 40.0 ± 10.6 | 24.0 ± 7.5 | 28.0 ± 12.9 | 32.0 ± 19.1 |
| Stress | 26.0 ± 9.0* | 56.0 ± 5.7 | 70.0 ± 12.2 | 46.0 ± 7.5 | 66.0 ± 15.6 | 46.0 ± 11.5 | 74.0 ± 10.3* | 74.0 ± 13.5 | |
| 20 s | Control | 20.0 ± 8.6 | 2.0 ± 2.2 | 12.0 ± 10.8 | 36.0 ± 15.2 | 12.0 ± 10.8 | 4.0 ± 4.4 | 14.0 ± 5.7 | 20.0 ± 12.2 |
| Stress | 18.0 ± 8.9 | 20.0 ± 10.0 | 36.0 ± 15.2 | 20.0 ± 11.7 | 30.0 ± 10.6 | 44.0 ± 10.3* | 34.0 ± 17.5 | 24.0 ± 9.0 | |
| SR choices (%) | |||||||||
| 1 s | Control | 10.0 ± 6.1 | 18.0 ± 10.2 | 16.0 ± 11.5 | 32.0 ± 8.9 | 14.0 ± 8.3 | 16.0 ± 2.7 | 32.0 ± 11.4 | 22.0 ± 6.5 |
| Stress | 18.0 ± 5.4 | 6.0 ± 4.4 | 18.0 ± 7.4 | 10.0 ± 3.5* | 16.0 ± 8.3 | 24.0 ± 8.3 | 6.0 ± 2.7* | 0* | |
| 10 s | Control | 34.0 ± 9.0 | 48.0 ± 14.3 | 62.0 ± 15.5 | 56.0 ± 21.1 | 42.0 ± 10.2 | 76.0 ± 7.5 | 72.0 ± 12.9 | 68.0 ± 19.1 |
| Stress | 42.0 ± 17.4 | 26.0 ± 10.3 | 34.0 ± 22.2 | 34.0 ± 13.0 | 32.0 ± 16.3 | 40.0 ± 16.2 | 24.0 ± 11.5* | 24.0 ± 14.4 | |
| 20 s | Control | 60.0 ± 11.7 | 78.0 ± 15.1 | 78.0 ± 12.9 | 62.0 ± 14.7 | 60.0 ± 16.9 | 96.0 ± 4.4 | 86.0 ± 5.7 | 80.0 ± 12.2 |
| Stress | 38.0 ± 21.3 | 52.0 ± 24.3 | 46.0 ± 12.2 | 42.0 ± 21.3 | 50.0 ± 23.1 | 36.0 ± 18.2* | 54.0 ± 21.6 | 56.0 ± 19.5 | |
B-2 and B-1: basal; S1-S4: 24 h after each stress episode; 1w and 2w: 1 and 2 weeks after the last stress episode. Stressed HI animals showed significant increases in LR choices at 1 s delay, S2 [F(1,8) = 8.72, p = 0.018, ηp2 = 0.52], 1w [F(1,8) = 6.14, p = 0.038, ηp2 = 0.43] and 2w [F(1,8) = 14.23, p = 0.005, ηp2 = 0.64]; 10 s delay, B-2 [F(1,8) = 9.96, p = 0.013, ηp2 = 0.55] and 1w [F(1,8) = 9.61, p = 0.015, ηp2 = 0.54]; and 20 s delay, S4 [F(1,8) = 15.68, p = 0.004, ηp2 = 0.66]. Stressed HI animals showed significant decreases in SR choices at 1 s delay, S2 [F(1,8) = 6.54, p = 0.034, ηp2 = 0.45], 1w [F(1,8) = 6.14, p = 0.038, ηp2 = 0.43] and 2w [F(1,8) = 14.23, p = 0.005, ηp2 = 0.64]; 10 s delay, 1w [F(1,8) = 9.60, p = 0.015, ηp2 = 0.54]; and 20 s delay, S4 [F(1,8) = 12.76, p = 0.007, ηp2 = 0.60]. Data are the mean ± SEM (n = 5, per group). *p < 0.05 compared to Control after planned comparisons.