Subject: | | Re: return to: Multiple modulators using the multiple conditions option- SPM5 |
From: | | Jan Gläscher <[log in to unmask]> |
Reply-To: | | [log in to unmask][log in to unmask]> 8/7/2007 6:05 AM >>> > > Hi Darren and Shelly > > I had this problem previously, it's not serious (thanks to > Karl for an off-list answer). > > I found an apparently singular covariance matrix C at the > deconvolution step which causes an error in spm_PEB from line > 351 in spm_peb_ppi, i.e. > C=spm_PEB(Y,P). > > This turned out to be due to a sparse matrix inversion > setting in spm_PEB and is not a serious problem but can be > resolved by setting exp(-32) to > exp(-16) in > > line 371 (of spm_PEB) ==> C = inv(C + speye(length(C))*exp(-32)); > > This makes sure that C is not too close to singular and > inversion proceeds without warnings. > > Hope this helps > > Alexa > > > > -----Original Message----- > From: SPM (Statistical Parametric Mapping) > [mailto:[log in to unmask]] On Behalf Of d gitelman > Sent: 07 August 2007 00:47 > To: [log in to unmask] > Subject: Re: [SPM] PPI Analysis: SPM5 Produces Matlab Warning > > Hi Shelly: > > Could you please provide a bit more information > > 1) How many conditions for each session and which ones are > you modeling. > Also how many trials per condition per session? > > 2) Does the warning occur for every PPI calculation. If you > use a multisession spm i assume you are calculating 2 PPI's > per subject. > > 3) what is the version of spm.m, of spm_peb_ppi.m and of > spm_regions.m. You can used the attached script to return the > version strings. Put the script somewhere in your matlab > path. Start matlab. cd to the spm5 directory and type > retVer('spm.m'), etc. > > darren > > > -----Original Message----- > > From: SPM (Statistical Parametric Mapping) > [mailto:[log in to unmask]] > > On Behalf Of Shelly Fitzgerald > > Sent: Friday, August 03, 2007 6:03 PM > > To: [log in to unmask] > > Subject: [SPM] PPI Analysis: SPM5 Produces Matlab Warning > > > > Dear SPM'ers, > > > > I have a question regarding PPI using SPM5. Thus far I've > conducted > > the following steps: > > > > 1. run 1st level stats (2 sessions per subject; each > session modeled > > separately in the same design) 2. extract VOIs for each session 3. > > calculate PPI regressors for each VOI > > > > While calculating the PPI regressors, however, I receive > the following > > matlab warning: > &üˆtÉb |
Date: | | Tue, 28 Aug 2007 10:51:30 -0700 |
Content-Type: | | text/plain |
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Hi Will,
Darren has changed the inplementation of setting up multiple modulators
for one
condition (using the multiple conditions option) in one of the recent updates.
Try installing the latest updates and take a close look at the task-specific
help for the multiple conditions option when setting it up via the GUI. There
he explains how the struct array has to be defined.
Cheers,
Jan
Quoting William Cunningham <[log in to unmask]>:
> Hello all,
>
> I saw this discussion from last year, and I was wondering whether anyone had
> found a work around for this.
>
> Specifically, is there a way to batch (presumably through the multiple
> conditions option) multiple parametric modulators for a single condition?
>
> Thanks again (and thanks for the answers to my previous questions
> this month).
> Best,
> Wil
>
>
> On Wed, 6 Dec 2006 17:47:31 +0100, Volkmar Glauche
> <[log in to unmask]> wrote:
>
>> Emmanuel,
>>
>> From reading the code, I understand that this is currently not possible. I
>> have just 10 minutes ago had a discussion about this with a colleague
>> about the same issue.
>> I have no idea how long it would take to change the code and get it
>> running...
>>
>> Volkmar
>>
>> On Wed, 6 Dec 2006, E A Stamatakis wrote:
>>
>>> Hi All,
>>>
>>> I have a single session fMRI experiment with 5 conditions and 3 modulators
>>> each for the first 2 conditions. The last 3 conditions have no
>>> modulators. I
>>> want to use the multiple conditions option in SPM5, i.e. save a .mat file
> with
>>> all the numbers. Is this possible? I have tried one modulator per condition
>>> and this works fine but I can't figure out how to define multiple
>>> modulators
>>> when using the multiple conditions option.
>>>
>>> Many thanks for your help,
>>>
>>> Emmanuel A Stamatakis PhD Tel: +44 (0) 1223 766454
>>> Department of Experimental Psychology University of Cambridge
>>> Downing Street
>>> Cambridge CB2 3EB
>>> U.K. http://csl.psychol.cam.ac.uk
>>>
>>>
>>
>> --
>> Volkmar Glauche
>> -
>> Department of Neurology [log in to unmask]
>> Universitaetsklinikum Freiburg Phone 49(0)761-270-5331
>> Breisacher Str. 64 Fax 49(0)761-270-5416
>> 79106 Freiburg http://fbi.uniklinik-freiburg.de/
>> =========================================================================
>
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