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Dear Peter, Yes trial onsets are identical for each subject for the regressors I defined in the GLM for DCM. Yes all VOIs have identical names for each subject and stored in respective subject's SPM.mat directory. Best, Andy On Thu, Oct 15, 2015 at 8:40 PM, Zeidman, Peter <[log in to unmask]> wrote: > Hi Andy, > > Two questions so that I can write this correctly for you: > > > > - Are the trial onsets identical for each subject, or do you have > different onsets per subject? > > - Can I assume that the VOIs have identical names for each subject, stored > in the same directory as each subject’s SPM.mat? > > > > Best, > > P > > > > *From:* Andy Yeung [mailto:[log in to unmask]] > *Sent:* 15 October 2015 12:47 > *To:* Zeidman, Peter <[log in to unmask]> > *Cc:* [log in to unmask] > > *Subject:* Re: [SPM] Automated DCM specification > > > > Dear Peter, > > > > Yes I vary modulatory input (none, forward only, backward only, > bidirectional) in each inter-node connection. > > 64 models. But since I do 34 subjects, that's why I mentioned 64*34 = 2176 > models. > > > > I would definitely appreciate a lot if you could help me write a script. > > > > Best, > > Andy > > > > On Thu, Oct 15, 2015 at 5:59 PM, Zeidman, Peter <[log in to unmask]> > wrote: > > Dear Andy (CC mailing list), > > You have two options. You can either do an automatic search over > sub-models (by specifying each subject’s full model, then clicking > ‘optimise’ in the DCM GUI and selecting all full models). The search > conducted by this ‘post-hoc’ procedure won’t necessarily include all the > models you are interested in. > > > > If you want to manually specify the specific models, then it’s easy to > write a script - I can help you with that. But I don’t understand why you > have 2176 models. If you’re just varying the modulatory input, surely it’s > 2^6=64 models? > > > > Best, > > P > > > > *From:* Andy Yeung [mailto:[log in to unmask]] > *Sent:* 15 October 2015 05:43 > *To:* Zeidman, Peter <[log in to unmask]> > *Subject:* Fwd: [SPM] Automated DCM specification > > > > Dear Dr Zeidman, > > > > I would like to know if there's a way to specify multiple DCM models for > multiple subjects using a batch or script so that my model space would be > complete/exhaustive. > > Clicking those buttons using GUI is really excruciating and prone to > error... > > > > My hypothesis is that the driving input must be pointed at node C. While > all three nodes A, B, C are bilaterally intrinsically connected, the > modulatory input can be absent, feedforward, feedbackward or bidirectional > between any nodes. > > I've attached a figure for illustration. I've 34 subjects and already > extracted VOIs from all of them. > > So I guess I have 4 x 4 x 4 x 34 = 2176 models. > > > > I came across with this script, > http://www.fil.ion.ucl.ac.uk/spm/data/attention/dcm_spm8_batch.m > > But I don't know how to apply it to my case... I would be really grateful > if you could help. > > Thank you so much for your advice. > > > > Best, > > Andy > > > > ---------- Forwarded message ---------- > From: *Andy Yeung* <[log in to unmask]> > Date: Thu, Oct 15, 2015 at 7:07 AM > Subject: Re: [SPM] Automated DCM specification > To: "Arash Z. Sadeghi" <[log in to unmask]> > Cc: SPM <[log in to unmask]> > > Thank you Arash for suggesting writing a code for a single subject. > > I'm no good at coding. Is there a template available in SPM or online? > > > > Best, > > Andy > > > > On Wed, Oct 14, 2015 at 7:22 PM, Arash Z. Sadeghi <[log in to unmask]> > wrote: > > Hi, > > If you mean specifying DCMs for a group, first you have to specify DCMs > for a single subject and there is a code to automatically specify those for > the whole group. > > If you mean specifying DCMs for a single subject, just write a code to > change the matrices and rename the mat file. It will work fine. > > Best, > > > > On Wed, Oct 14, 2015 at 1:19 PM, Andy Yeung <[log in to unmask]> > wrote: > > Dear all SPM users, > > > > May I know if there's a script/method to create all/multiple possible DCMs > in an automated way instead of clicking the small buttons in DCM GUI? I'm > afraid of clicking the wrong buttons or naming the DCM files wrongly. > > > > I have 3 nodes (A, B, C), all bilateral intrinsic connections, node A > receiving driving input. > > But the modulatory input can insert in various plausible connections. > > > > Best, > > Andy > > > > > > -- > > Arash Z. Sadeghi > PHD candidate of Biomedical Engineering > Tehran University of Medical Sciences > > Researcher in Imam Hospital, Imaging Center, NIAG. > > > > > > >