Table 2 Mean (SD) errors and response latencies and probabilities of win–stay/lose–shift behaviour based on feedback type (80% valid, 20% misleading) in the two treatment groups
Measure | Placebo | Escitalopram | Group differencea | ||
|---|---|---|---|---|---|
Stage 1 | Errors | 1.76 (3.73) | 4.55 (6.66) | p = 0.004 | |
RTs (ms) | 2016.06 (937.32) | 2165.79 (968.95) | p = 0.532 | ||
Feedback type 80% accurate 20% misleading | |||||
Probabilities | Reward–stay | 80% | 86.74 | 75.6 | p = 0.043 |
20% | 1.14 | 4.03 | p = 0.104 | ||
Reward–shift | 80% | 5.97 | 9.48 | p = 0.125 | |
20% | 4.92 | 8.47 | p = 0.279 | ||
Lose–stay | 80% | 1.42 | 4.13 | p = 0.125 | |
20% | 88.64 | 72.18 | p = 0.009 | ||
Lose–shift | 80% | 5.87 | 10.79 | p = 0.032 | |
20% | 5.3 | 15.32 | p = 0.003 | ||
Stage 2 | Errors | 6.58 (2.57) | 7.58 (4.46) | p = 0.689 | |
RTs (ms) | 2251.86 (6285.86) | 1280.32 (865.23) | p = 0.237 | ||
Feedback type 80% accurate 20% misleading | |||||
Probabilities | Reward–stay | 80% | 68.75 | 63.71 | p = 0.376 |
20% | 11.74 | 15.32 | p = 0.359 | ||
Reward–shift | 80% | 6.06 | 8.57 | p = 0.238 | |
20% | 4.92 | 6.58 | p = 0.442 | ||
Lose–stay | 80% | 16.1 | 16.32 | p = 0.237 | |
20% | 70.08 | 62.9 | p = 0.971 | ||
Lose–shift | 80% | 10.07 | 12.6 | p = 0.684 | |
20% | 13.26 | 14.92 | p = 0.355 |
