关于MASK,请教,十分感谢!

在你们的文章中写到:“The global mean ALFF value was calculated for each participant within a group GM mask obtained by selecting a threshold of 0.2 on the mean GM map of all 54 subjects. ”(Human Brain Mapping 2012)
想请问:这里的0.2是指什么值,这种设定MASK的做法是在MRIcro--ROI--Apply intensity filter to volume中做的吗?

该做法能否应用于设置WM MASK?

caret

老師,我在使用caret時,在load SCENE時,點選"Fiducial_Left"(無論任一選項)
皆會跑出,以下之文字,是因為我少安裝了什麼嗎

The following errors occurred while applying the scene:
Human.PALS_B12.RIGHT_AVG_B1-12.INFLATED.clean.73730.coord does not exist.
Human.PALS_B12.LEFT_AVG_B1-12.INFLATED.clean.73730.coord does not exist.Surface named "Human.PALS_B12.RIGHT_AVG_B1-12.INFLATED.clean.73730.coord" not found.