Dear Douglas I will apprecite it if you can please clarify this simple question. If I optimise my design using Optseq, do you know if this de convolution process is implemented in SPM or any other software? and it is part of the processing behind the scenes? Or do I have to account for this using a specific software. Many tha is Aser
Sent from my Samsung Galaxy smartphone. -------- Original message --------From: fmri2013 <fmri2...@gmail.com> Date: 10/11/2017 19:30 (GMT+00:00) To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu> Subject: Re: [Freesurfer] Optseq and de convolution for rapid designs Many thanks Douglas If I optimise my design using Optseq, do you know if this de convolution process is implemented in SPM or any other software? and it is part of the processing behind th3 scenes? Or do I have to account for this using a specific software. Aser Sent from my Samsung Galaxy smartphone. -------- Original message --------From: Douglas Greve <gr...@nmr.mgh.harvard.edu> Date: 10/11/2017 19:24 (GMT+00:00) To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Optseq and de convolution for rapid designs It is because the random jitter creates differential amounts of overlap. Imagine if you have A=C+D and B=C-D. You know A and B, but you want C and D. You have two equations and two unknowns, so you can solve for C and D from A and B eventhough C and D "overlap" in A and B and you never see C or D by themselves. This is a type of deconvolution On 11/10/17 11:38 AM, Aser A wrote: Hi all I used Optseq to optimize rapid event designs with multiple conditions . I have a theortical question : how it is possible to distingwoh the close by trials ? Is it by de convoution ? How is it possible to deal with overallped trials ? Is it because the conditions are random so that when averaging them the distingwoh is possible? Many thanks Aser _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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