Table 2.

Comparison of Gray matter volume between groups.

	Regions	Number of voxels	Peak activation strength (T)	Peak coordinates
				x	y	z
PD-RBD < PD-nRBD
	Temporal_Mid_L	898	−4.1544	−55.5	−22.5	−21
	Cuneus_L, Cuneus_R	375	−3.9194	4.5	−88.5	25.5
PD-RBD < HC
	Calcarine_L	234	−3.439	−22.5	−51.0	0
PD-nRBD > HC
	Temporal_Mid_R	443	4.4134	64.5	−4.5	−19.5
	Precentral_R	307	3.8969	52.5	1.5	28.5
	Cingulum_Mid_R, Cingulum_Mid_L	370	3.5289	1.5	−34.5	48
PD-nRBD < HC
	Temporal_Mid_R	448	−4.6033	51	−12	−24
	Putamen_R	734	−3.9001	24	−40.5	4.5
	Putamen_L	567	−3.9604	−19.5	12	0
	Hippocampus_L	228	−4.2342	−19.5	−37.5	6
	Temporal_Sup_L	850	−3.762	−39	−28.5	13.5
	Postcentral_R	259	−4.1035	28.5	−30	55.5

GM, Gray matter; HC, Healthy controls; PD-RBD, Parkinson’s disease with RBD; PD-nRBD, Parkinson’s disease without RBD; MTG, Middle temporal gyrus; CUN, cuneus; CAL, calcarine; PUT, putamen; HIP, Hippocampus; STG, Superior temporal gyrus; PoCG, Postcentral gyrus; PreCG, precentral gyrus; MCG, middle cingulum gyrus; L, left hemisphere; R, right hemisphere.