[Freesurfer] Group analysis in QDEC: FWHM size for thickness and volume

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Dear Freesurfer experts,

I have two questions regarding group analysis in QDEC:

1. What is the most appropiate FWHM size when comparing the volume and cortical thickness of two groups? I was thinking in use 5 FWHM for volume and 10 FWHM for thickness, any suggestion?

2. After perform the correction for multiple comparisons, terminal says that it has been found a cluster in the right superior parietal lobule (please, see the attached screenshot). However this cluster do not appear in the fsaveage image. Is there any tutorial that explains how to plot the significant cluster in the fsaverage?. Maybe in freeview?

[image: imagen.png]

Thanks in advance.

Best regards,

Steve.