Proportionate choice of the eight trial types of “experimental” gambles resulting from the orthogonal combination of two levels of probability, magnitude of possible gains, and losses in our risky choice task administered to healthy adults who received 150 mg quetiapine XL or placeboa
| Probability of winning | Possible gains | Possible losses | Expected value |
|---|---|---|---|
| High (0.60) | Large (70) | Large (70) | 14 |
| Small (30) | 30 | ||
| Small (30) | Large (70) | −10 | |
| Small (30)* | 6* | ||
| Low (0.40) | Large (70) | Large (70) | −14 |
| Small (30) | 10 | ||
| Small (30) | Large (70) | −30 | |
| Small (30)* | −6* |
↵a“Expected values” for the “experimental” gambles equal the sums of gains and losses, weighted by their probabilities of occurrence (Kahneman and Tversky, 2000), varying between −30 and 30, with a mean of 0.
↵*“Experimental” gambles with low positive (6) or low negative (−6) expected values, in which proportionate choice departs from linear pattern.