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. Author manuscript; available in PMC: 2019 Aug 25.
Published in final edited form as: Nat Hum Behav. 2019 Feb 25;3(3):284–296. doi: 10.1038/s41562-018-0527-9

Figure 1. Schematic representation of the experimental design.

Figure 1.

A, Illustration of the sequence of events within a trial for Experiment 1, Experiment 2 and Experiment 4. At the beginning of each trial a Conditioned Stimulus (CS) was presented randomly in the upper or the lower portion of the screen for 1.5 – 4.5 s (uniformly distributed). After an anticipation screen of 3 s, a video showing the snack delivery appeared either to the right or the left side of the screen for 3s. The inter-trial interval (ITI) lasted for 4 – 8 s (uniformly distributed). At the end of each session participants received the actual snacks delivered during the task to be consumed. B, In Experiment 1 trial involved one of three CS, each of which primarily predicted (70%) either the snack delivery to the left (CS+ L), the snack delivery to the right (CS+ R), or no snack delivery (CS−).