Figure 1.

fMRI task, and response to difficult versus easy problem-solving. A, Examples of easy and difficult problems. In both examples, the second item is the correct answer. B, Regions significantly more active in the difficult than the easy condition (warm colors) and vice versa (cool colors), shown overlaid on surface renderings (top) and horizontal slices (bottom). N = 252. Slice positions are labeled in MNI coordinates and marked on the right hemisphere rendering. Activations are shown to a depth of 15 mm. Color scales indicate Cohen's d, thresholded at |d| > 0.5. (All effects greater than |d| > 0.13 are significant when controlling the FDR at < 0.05.)