Feedback-Related Potentials in a Gambling Task with Randomised Reward

Publication date: Available online 10 December 2015
Source:Data in Brief
Author(s): Faisal Mushtaq, Pablo Puente Guillen, Richard M. Wilkie, Mark A. Mon-Williams, Alexandre Schaefer
Event-related potentials (ERPs) time-locked to decision outcomes are reported. Participants engaged in a gambling task (see [1] for details] in which they decided between a risky and a safe option (presented as different coloured shapes) on each trial (416 in total). Each decision was accompanied with (fully randomised) feedback about the reward outcome (Win/Loss) and its magnitude (varying as a function of decision response; 5–9 points for Risky decisions and 1–4 points for Safe decisions). Here, we show data demonstrating: (a) The influence of Win feedback in the preceding outcome (Outcomet−1) on activity related to the current outcome (Outcomet); (b) Difference wave analysis for outcome expectancy- separating Expected Outcomes (consecutive loss trials subtracted from consecutive reward) from Unexpected Outcomes (subtracting Losst−1Wint trials from Wint−1Losst trials); (c) Difference waves separating Switch and Stay responses for Outcome Expectancy; (d) The effect of magnitude induced by decisions (Riskt vs. Safet) on Outcome Expectancy; and finally, (e) Expectations reflected by response switch direction (Risk to Safe responses vs. Safe to Riskt) on the FRN at Outcomet.



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