# Estimating the regularization parameter for HCP MEG resting state source reconstruction

**URL:** <https://mne.discourse.group/t/estimating-the-regularization-parameter-for-hcp-meg-resting-state-source-reconstruction/5177>\
**Category:** Support & Discussions\
**Tags:** source-localization, meg\
**Created:** [June 29, 2022, 2:57pm UTC](https://mne.discourse.group/t/estimating-the-regularization-parameter-for-hcp-meg-resting-state-source-reconstruction/5177 "2022-06-29T14:57:32Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [July 5, 2022, 11:31am UTC](https://mne.discourse.group/t/estimating-the-regularization-parameter-for-hcp-meg-resting-state-source-reconstruction/5177/15 "2022-07-05T11:31:04Z")

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@Dominik

I just asked @agramfort about this while we were fighting with the coffee machine (spoiler: we won! 💪 ☕)

He said this parameter (SNR of 3 for averaged, 1 for non-averaged data) “was established by Matti Hämäläinen 20 years ago”, and that “no one touches this parameter”.

Hence … I would say, case closed. 😉

Best wishes,  
Richard

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