Hi Chuanji,

The colors are additive, so the yellow regions are highlighting areas that are in both of your open overlays. The "rightSTG" has a center in the right hemisphere superior temporal gyrus, so that is where you see an overlap between the two overlays. The "leftASTG" has a center in the left anterior portion of the superior temporal gyrus, so that is where you see both overlays at the same time. I would tend to use "Green" and "Red" as your overlays, so the combination is pure "YELLOW" - the winter overlay has a broader spectrum of colors. I would also consider using a binary threshold for the anatomical overlays. If I were scripting these I would write:

Both regions overlap in right STG:

BEGIN
RESETDEFAULTS;
MESHLOAD('BrainMesh_ICBM152_smoothed.mz3');
OVERLAYLOAD('rightPSTG_ALE_pN001.nii');
OVERLAYCOLORNAME(1, 'Green');
OVERLAYMINMAX(1, 0.04, 0.04);
OVERLAYLOAD('meta_map_rightPSTGfinal.nii');
OVERLAYCOLORNAME(2, 'Red');
OVERLAYMINMAX(2, 0.06, 0.06);
OVERLAYADDITIVE(true);
SHADERNAME('Minimal');
OVERLAYTRANSPARENCYONBACKGROUND(50);
SHADERXRAY(1, 0.3);
END.

Both regions overlap in left temporal pole:

BEGIN
RESETDEFAULTS;
MESHLOAD('BrainMesh_ICBM152_smoothed.mz3');
OVERLAYLOAD('leftASTG_ALE_pN001.nii');
OVERLAYCOLORNAME(1, 'Green');
OVERLAYMINMAX(1, 0.06, 0.06);
OVERLAYLOAD('meta_map_leftASTGfinal.nii');
OVERLAYCOLORNAME(2, 'Red');
OVERLAYMINMAX(2, 0.06, 0.06);
OVERLAYADDITIVE(true);
SHADERNAME('Minimal');
OVERLAYTRANSPARENCYONBACKGROUND(50);
SHADERXRAY(1, 0.3);
END.