Differences in BOLD response on the I-FEPT for AN (red) and HC (blue) for a) linear trend analysis where happy > mildly happy > neutral facial expressions (p = 0.006, FDR Corrected), b) neutral facial expressions (p = 0.009, FDR Corrected), c) mildly happy facial expressions (p = 0.01, FDR Corrected), and d) prototypical happy facial expressions (p = 0.01, FDR Corrected).