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. 2015 Feb 12;6:90. doi: 10.3389/fpsyg.2015.00090

FIGURE 2.

FIGURE 2

Negative PE signals. (A) Normal events consisted of a yellow light (1 s) and no juice delivery 10 s following the light cue. Catch events designed to capture a negative reward PE consisted of presentation of the light cue (1 s) and no juice delivery at the expected time at 6 s following the light cue. The specific contrast designed to capture the negative PE was: [Juice not delivered (expected) > Juice not delivered (unexpected)]. (B) Left panel, negative PEs for controls display activity in bilateral putamen. Right panel, negative PEs in meditators did not yield significant voxels (see Table 1 for complete list of activations). (C) Left panel, group differences to negative reward PEs show activity in left putamen in controls. Right panel, parameter estimates for the significant voxels in left putamen display a drop in the BOLD signal at times when juice was expected but not delivered. Controls are shown in blue and meditators in red. Error bars indicate SE.