SCD and Lewy body dementia: As shown in the supplementary material (Fig. 3 and Table 2), RMTG achieved the largest AUCs in distinguishing NC from SCD (NC1 vs. SCD1, NC2 vs. SCD2, and NC vs. SCD; 0.638–0.717) when compared with the PCC (0.534–0.604) or the PCUN (0.499–0.562), and in distinguishing NC from the cognitively impaired groups (aMCI, ADD, and DLB), the AUCs of RMTG (0.959–1.000) were also comparable or even larger than the PCC (0.899–0.935) or the PCUN (0.617–0.741).