Dear Bastien,
The SPM function extracting peaks and clusters on a triangle surface
mesh is spm_mesh_max.m. The node indices (one-based) of all the
suprathreshold vertices are stored in xSPM.XYZ(1,:) that you can access
from the MATLAB workspace when looking at results.
And, yes, determining clusters requires the knowledge of the geometry of
the surface mesh. SPM will have used the mesh whose filename is stored
in the SurfaceId metadata of the GIfTI files.
Best regards,
Guillaume.
On 27/11/2018 17:08, CAGNA Bastien wrote:
> Dear SPM community,
>
> I'm doing GLM on surface in SPM and I'm wondering how should I do to
> find the coordinates of peaks given by T-test on surface (for example
> index of the node) rather than having it in the volume (X Y Z).
>
>
> For my study, I run Freesurfer's "recon all" and then project volumic
> data on surface. Then, I run the GLM in SPM and want to find clusters
> and peaks.
>
>
> More foundamentally, I'm wondering how is done the clustering with
> surfacic data ? Does it take into account the anatomical surface? If
> yes, which mesh does it takes?
>
>
> Best regards,
>
>
> Bastien CAGNA
>
> Institut des Neurosciences de la Timone, Aix-Marseille Université, FRANCE
>
>
>
>
--
Guillaume Flandin, PhD
Wellcome Centre for Human Neuroimaging
UCL Queen Square Institute of Neurology
London WC1N 3BG
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