Fig 1.
Time-course of events at a given trial of the BART task.
Note: Every inflation response was followed by an interval of 1000ms during which the participant heard a pumping sound and saw a process bar loading. The response resulted in either an increase in the balloon size or to a balloon burst. Following a cash-in response or a balloon burst, positive and negative feedback screens (visual and auditory feedback) were presented respectively, for 1200ms.
Table 1.
Probabilistic and pay-off structure in the BART Task.
Table 2.
Behavioral Performance in the BART Task: Descriptive Statistics.
Fig 2.
Risk taking in the BART task as a function of number of inflations in each experimental block.
Note: The dashed line represents performance in the baseline; error bars show 95% confidence intervals; asterisks indicate significance values (*p < .05, **p < .005, ***p < .001).
Fig 3.
Risk taking as a function of trial number 1–60, for each block of trials.
Note: middle dashed line and circles indicate performance in the baseline; bottom bold black line and down-pointing arrows denote performance in the negative message block; top solid grey line and up-pointing arrows denote performance in the positive message block. No significant changes in risk taking across 60 trials were found in the two experimental blocks.
Table 3.
Descriptive Statistics for Reaction Times (RT) in the BART Task.
Fig 4.
Averaged regression lines of reaction times (RTs) for inflation responses, as a function of increase in inflation step number, for each of the three blocks of trials.
Note: the top light grey dashed line represents averaged regression slope in the baseline. The two bottom dark solid and grey dashed lines show averaged regression slope in the negative and in the positive message blocks, respectively. The first inflation step was excluded from all analyses (see text).