Gaze-dependent evidence accumulation predicts multi-alternative risky choice behaviour
Fig 2
Context effects are present in choices and relative dwell time.
Participants’ choices were influenced by asymmetrically dominated decoys and, to a lesser extent, by extreme compromise-making decoys. (a, d) Ternary plots of individual relative choice frequencies for target (lower left, teal), competitor (top, pink), and decoy (lower right, yellow) alternatives in attraction (a) and compromise (d) trials. Each dot represents one participant. The position on the simplex indicates relative choice frequencies for alternatives. Straight lines from the centre indicate equal frequencies for two alternatives. The red "x" indicates the group average. (b, e) Relative choice frequencies in attraction (b) and compromise (e) trials. In attraction trials, some participants strongly favoured the target alternative and almost no decoy choices were made. While target alternatives are still chosen more frequently than competitors in compromise trials, the effect is less pronounced, and extreme decoys are still chosen frequently. (c, f) Relative dwell time towards alternatives. In both, attraction (c) and compromise (f) trials, target alternatives received greater relative dwell times than competitors. d denotes Cohen’s d from paired BEST analysis with HDI95 given in brackets. Violin plots show kernel density estimates of distributions of individual values. Box plots mark lower and upper quartiles and median. Whiskers extend from first and last datum within 1.5 times the interquartile range from lower and upper quartiles, respectively. Values outside this range are indicated by open circles.