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. 2016 Jan 29;6:2036. doi: 10.3389/fpsyg.2015.02036

Table 1.

Description of task trials.

Type of trial Probability of receiving the non-zero amount (%) Non-zero amount receivable upon choosing the alternative urn
2.50 € (+11.11%) 3.00 € (33.33%) 4.50 € (+100%) 9.00 € (+300%) 22.50 € (+900%)
Risk 10 0.25 € 0.30 € 0.45 € 0.90 € 2.25 €
Risk 25 0.63 € 0.75 € 1.13 € 2.25 € 5.63 €
Risk 50 1.25 € 1.50 € 2.25 € 4.50 € 11.25 €
Risk 75 1.88 € 2.25 € 3.38 € 6.75 € 16.88 €
Risk 90 2.25 € 2.70 € 4.05 € 8.10 € 20.25 €
Control 100 2.50 € 3.00 € 4.50 €

The cells in columns 3–7 display the expected values of the 33 randomly played task trials. Choices are always made between a safe urn yielding 2.25 € and a risky, ambiguous or control urn. The first five rows (columns 3–7) display the expected values of the 25 risky urns, with expected values equal to the safe choice on the bottom-left to top-right diagonal. The last row (columns 3–7) presents the expected value of the three control urns.