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 fmri2013@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 greve@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
I don't know about SPM, I would imagine you could do it somehow. FSL has an implementation. The deconvolution method is usually called "FIR" (finite impulse response)
On 11/16/2017 10:36 AM, fmri2013 wrote:
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 fmri2013@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 greve@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
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
freesurfer@nmr.mgh.harvard.edu
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Douglas N Greve -
fmri2013