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(A) Gray matter reduction in ID patients compared to HC (in blue). (B) Reduced relative cerebral glucose metabolism in ID patients compared to HC (in blue). (C) Lower FA in ID patients relative to HC (in blue). ACC = anterior cingulate cortex, AMYG = amygdala, FA = fractional anisotropy, GM = gray matter, HC = healthy controls, ID = insomnia disorder, MFG = middle frontal gyrus, PCG = posterior cingulate gyrus.
