Dear Georgios, Thank you again for your very helpful answer. I have succeeded in parcellating my results using the Yeo et al. atlas, with the *.dlabel.nii file provided with the parcellated HCP MEG data (107 nodes), and with the wb_command -cifti-parcellate line code.
However, I have troubles to find equivalent *.dlabel.nii files for other parcellations scheme, like for the example the Desikan-Killiany atlas. Could you help me? Also, should I just use the ft_resampledata Fieldtrip function in order to go from the 165K or 32K to the 4K dlabel files, or am I missing something? Regards, Benjamin De : Georgios Michalareas <g...@ae.mpg.de> Envoyé : lundi 26 mars 2018 19:20 À : Benjamin Chiêm <benjamin.ch...@uclouvain.be>; hcp-users@humanconnectome.org Objet : Re: [HCP-Users] MEG processing pipelines Hi Benjamin, Sorry for late reply but I was out of office. Regarding single trial source analysis I have put together some code that shows you how to project all motor trials for LH into source space in a matrix with dimensions: Nsources * Ntimespoints * Ntrials beware this matrix for the specific subject is 11GB. Please find the code attached in file testsourcepertrial1.m I have put some comments i hope they help. Regarding parcellating the data, you have to use the workbench command tool to donwload all parcelations from thw 165 K representation to the 4K one used for the MEG source level analysis. I ll have a look and come back to you on this. Till then I hope the code I am sending you helps Best Giorgos On 3/16/2018 3:38 PM, Benjamin Chiêm wrote: Dear HCP experts, In the context of my PhD thesis (using HCP data), I had some questions about MEG processing pipelines. In my research, I somehow need the MEG data during motor task, in the source space (i.e. after beamforming), for each trial and each individual separately. It seems that the MEG pipelines average data over trials for each individual, and that they reduce the temporal resolution of the data when going from 'tmegpreproc' files to 'srcavglcmv'. So my two questions are: - Is it possible, from the 'tmegpreproc' file for each individual, to perform sources reconstruction with Linearly Constrained Minimum Variance beamformer for each trial independently, and to keep the original temporal resolution (about 500Hz)? What are the steps to follow? I tried to play with options like « cfg.rawtrial = yes » or « cfg.keeptrials = yes » in ft_timelockanalysis and ft_sourceanalysis of the hcp_srcavglcmv_contrasts.m file, but to be honest I am not sure of what I am doing... - After projection on the sources space, how can I parcellate the data, using for example the Desikan-Killiany atlas? I hope I am clear enough in my explanations. Thank you again for the amazing work you're doing! Regards, Benjamin Chiêm _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org<mailto:HCP-Users@humanconnectome.org> http://lists.humanconnectome.org/mailman/listinfo/hcp-users [https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png]<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> Virus-free. www.avg.com<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient> -- ------------------------------------------------ Dr. Georgios Michalareas Neuroscience Department Max Planck Institute for Empirical Aesthetics email: g...@aesthetics.mpg.de<mailto:g...@aesthetics.mpg.de> phone: +49 69 8300479-325 ------------------------------------------------ _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
