The authors would like to thank Danielle Mizuiri and Anne Findlay for collecting much of the MEG data, and all members and collaborators of the Biomagnetic Imaging Laboratory for their support. CC acknowledges support from National Natural Science Foundation of China grant 62007013 and Hubei Provincial Natural Science Foundation of China under Grant 2021CFB384. AH acknowledges scholarship support from the Machine Learning/Intelligent Data Analysis research group at Technische Universität Berlin, the Berlin Mathematical School (BMS) and the Berlin Mathematics Research Center MATH+. SSN acknowledges support from NIH grants R01EB022717, R01DC013979, R01NS10-0440, R01DC176960, R01DC017091, R01AG062196, UCOP-MRP-17-454755, T32EB001631, DOD CDMRP Grant W81XWH1810741, and an industry research contract from Ricoh MEG Inc. SH acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant agreement No. 758985).