Figure 4.

The upper panel is showing predicted signal at US yielded by the partially signed TD model (dotted) and the actual MRI signal (solid) obtained from a sphere with a radius of 6 mm around the peak voxel (−15, 12, −6) in the ventral striatum. Values are mean‐centered and the x‐axis indicates volume number (TR = 2,240 ms). While only the first 80 volumes are shown for clarity, they are representative of the entire session as shown by the strong cross‐correlation between the predicted signal from the partially signed model and the MRI signal (lower left panel). The dashed line indicates the confidence limit and the x‐axis shows lag number where lag number reflects number of time points (TRs). The lower right is the SPM of the activation in the ventral striatum correlating with the salience prediction error obtained at the US by the partially signed version of the TD model. The colors refer to t‐values.