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. Author manuscript; available in PMC: 2021 Jul 19.
Published in final edited form as: Nature. 2021 Jan 6;591(7849):270–274. doi: 10.1038/s41586-020-03115-5

Fig. 1. Experimental design.

Fig. 1

(a) Training set 1: stimuli varied in reward magnitude (drops of juice), cued by colour. Training set 2: stimuli varied in reward probability, cued by dot numerosity. (b) Testing set: stimuli varied in both magnitude and probability. Grey: familiar options; white: novel options. Crossed squares were not tested. Pairs of numbers exemplify choices in different conditions. (c) Stimulus appearance in two example trials. (d) Diagram of the 2 (familiarity) by 3 (dimensionality) design. (e) Illustration of the experiments’ features. 1: fMRI and decision task; 2: fMRI and single option (no decision) task; 3: TUS and decision task. (f) Timeline. Grey: training with sets 1 and 2 on alternating days. Red: experiment 1. Blue: experiment 2. Yellow: experiment 3.