Question about fiducials and head modeling for HCP MEG data in SPM / DCM

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tao g

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Dec 17, 2025, 2:54:20 AM (4 days ago) Dec 17

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HI MEG Team,

I am currently working with the HCP MEG dataset and planning to perform source reconstruction and subsequent DCM-CSD (including CMC-DCM) analyses within the SPM framework. However, I noticed that the preprocessed HCP MEG files do not include explicit fiducial information (nasion, left/right preauricular points), which makes it difficult to compute the head model in SPM and proceed with source reconstruction and DCM analyses. I would like to ask whether fiducial locations are available in any separate files or metadata, or if there is a recommended workflow for using HCP MEG data in SPM (e.g., importing a head model computed in FieldTrip or using template-based coregistration). Any advice or suggested best practices would be greatly appreciated.