Figure 2.

Stimuli and Procedure. (A) During encoding trials, a cartoon character was presented together with two objects. Participants guessed which of the two objects the character preferred and positive or negative feedback indicated whether the selected object was preferred or not preferred. During testing, trials were identical to the encoding with the exception that a confidence rating was performed instead of receiving feedback. (B) The impact of reward delivery on memory encoding was assessed through two types of feedback, positive and negative. (C) The impact of reward anticipation on memory encoding was assessed by manipulating the ratio between the number of positive and negative feedback assigned to a character. Specifically, characters were divided into three different categories.