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Group-discriminating regions across three modalities, with a threshold of |Z| > 2.5. Two-sample t-tests were performed on mixing coefficients of each IC for each modality. If the components of the same index show group differences in more than one modality, they are called modality-common (or joint) group-discriminative ICs in green frames; otherwise, it is called a modality-unique group-discriminative IC, e.g., GM_IC5, ALFF_IC3 in red frames.
