FIGURE 1. Task design.
From the following article:
Cortical substrates for exploratory decisions in humans
Nathaniel D. Daw, John P. O'Doherty, Peter Dayan, Ben Seymour and Raymond J. Dolan
Nature 441, 876-879(15 June 2006)
doi:10.1038/nature04766
a, Illustration of the timeline within a trial. Initially, four slots are presented. The subject chooses one, which then spins. Three seconds later the number of points won is revealed. After a further second the screen is cleared. The next trial is triggered after a fixed trial length of 6 s and an additional variable inter-trial interval (mean 2 s). b, Example of mean payoffs that would be received for choosing each slot machine (four coloured lines) on each trial, demonstrating their independent random diffusion. The payoff received for a particular choice is corrupted by gaussian noise around this mean.