Fig. 3: mPFC activity for the unimodal and crossmodal groups.

Different activation levels of mPFC in the two groups during the acquisition and generalization phases. *p < 0.05, **p < 0.01, and ***p < 0.001. Note: GS–CS− comparisons were conducted as an exploratory analysis and are not shown in the figure for consistency with other measures (i.e., US expectancy ratings and SCR).