title: Feedback-related potentials in a gambling task with randomised reward.
abstract: 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 associated 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 (Outcome t-1) on activity related to the current outcome (Outcome t ); (b) difference wave analysis for outcome expectancy- separating Expected Outcomes (consecutive Loss trials subtracted from consecutive reward) from Unexpected Outcomes (subtracting Loss t-1Win t trials from Win t-1Loss t trials); (c) difference waves separating Switch and Stay responses for Outcome Expectancy; (d) the effect of magnitude induced by decisions (Risk t vs. Safe t ) on Outcome Expectancy; and finally, (e) expectations reflected by response switch direction (Risk to Safe responses vs. Safe to Risk t ) on the FRN at Outcome t .
authors: School of Psychology, University of Leeds, Leeds, West Yorkshire, United Kingdom.
authors: Faisal
authors: F
authors: Mushtaq
authors: School of Psychology, University of Leeds, Leeds, West Yorkshire, United Kingdom; School of Computing, University of Leeds, Leeds, West Yorkshire, United Kingdom.
authors: Pablo Puente
authors: PP
authors: Guillen
authors: School of Psychology, University of Leeds, Leeds, West Yorkshire, United Kingdom.
authors: Richard M
authors: RM
authors: Wilkie
authors: School of Psychology, University of Leeds, Leeds, West Yorkshire, United Kingdom.
authors: Mark A
authors: MA
authors: Mon-Williams
authors: School of Business, Monash University, Sunway Campus, Selangor, Malaysia.
authors: Alexandre
authors: A
authors: Schaefer
keywords: Decision-making; Event-related potentials; Feedback-related; Negativity; Reward prediction error; Reward processing