Table 1.

Definition of variables in Task 1 and Task 2a

VariableDefinition
Task 1
1offer value Aρ qA
2offer value BqB
3chosen valuevalue of chosen offer
4chosen juicebinary; 1 if A chosen; 0 if B chosen
Task 2
1AB | BAbinary; 1 in AB trials; 0 in BA trials
2offer value A | ABρ qA in AB trials, 0 in BA trials
3offer value A | BAρ qA in BA trials, 0 in AB trials
4offer value B | ABqB in AB trials, 0 in BA trials
5offer value B | BAqB in BA trials, 0 in AB trials
6offer1value of offer1
7offer2value of offer2
8chosen valuevalue of chosen offer
9chosen value Achosen value if A chosen, 0 otherwise
10chosen value Bchosen value if B chosen, 0 otherwise
11chosen juice Abinary; 1 if A chosen; 0 if B chosen
12chosen juice Bbinary; 0 if A chosen; 1 if B chosen
  • aValues were always defined in units of juice B (uB) based on relative values derived from the probit regressions (Eqs. 1, 2). Thus, the value of qB drops of juice B was equal to qB; the value of qA drops of juice A was equal to ρ qA. Each variable could be encoded with a positive or negative sign. For Task 2, variables chosen juice A and chosen juice B coincided, except for the sign (we use this notation for clarity).