[FieldTrip] fft_timelockgrandaverage

["Jörn M. Horschig"]

Dear Leo,

I suppose you are using Matlab2011a, am I right?  If so, then please see 
this bug:
http://bugzilla.fcdonders.nl/show_bug.cgi?id=918

Unfortunately, we do not have a running version of Matlab2011a, yet, so 
we cannot look into this issue to track it down :/
In case you do not have Matlab2011a, this might be a different story.

Best,
Jörn

On 9/22/2011 4:23 PM, Zizlsperger Leopold wrote:
> Dear Steve
> thanks for your reply. I think that solves my problem.
> (I tried that already, but always got
> "??? Improper index matrix reference"
> but looks like I have to look closer again into the rest of the 
> script, seems to be a problem with the clusters themselves).
> Thanks for your help
> Best
> Leo
>
>
> On 22.09.2011, at 15:48, Stephen Politzer-Ahles wrote:
>
>> Leopold,
>>
>> The way I dealt with this was by running ft_timelockgrandaverage() 
>> twice, once with keepindividual='yes' and once with 
>> keepindividual='no', and I saved the structures under different names 
>> (i.e., 'condition1_grandindividuals' and 'condition1_grandonly'). I 
>> used the former one for cluster statistics, and the latter one (which 
>> has the .avg field) for plotting.
>>
>> Alternatively, for each grand average structure with individuals you 
>> could just create an .avg field by running the following:
>>
>> GA.avg = squeeze( mean(GA.individual,1) );
>>
>> This should average across individuals.
>>
>> Best,
>> Steve Politzer-Ahles
>>
>>
>>
>>     Message: 2
>>     Date: Thu, 22 Sep 2011 14:49:14 +0200
>>     From: Zizlsperger Leopold <zizlsperger at gmail.com
>>     <mailto:zizlsperger at gmail.com>>
>>     To: fieldtrip at donders.ru.nl <mailto:fieldtrip at donders.ru.nl>
>>     Subject: [FieldTrip] ft_timelockgrandaverage
>>     Message-ID: <058344EB-FCDD-42FB-8A60-E70A339F35F2 at gmail.com
>>     <mailto:058344EB-FCDD-42FB-8A60-E70A339F35F2 at gmail.com>>
>>     Content-Type: text/plain; charset=us-ascii
>>
>>     Dear Fieldtrippers,
>>
>>     in a within-subjects design I use ft_timelockgrandaverage with
>>     cfg.keepindividual = 'yes' to average timelocked EEG data (10
>>     subjects) of the form:
>>
>>      avg: [29x5000 double]
>>              var: [29x5000 double]
>>             time: [1x5000 double]
>>              dof: [29x5000 double]
>>            label: {29x1 cell}
>>            trial: [172x29x5000 double]
>>           dimord: 'rpt_chan_time'
>>        trialinfo: [172x28 double]
>>              cfg: [1x1 struct]
>>
>>     I stick closely to the FieldTrip tutorial for cluster permutation
>>     statistics. I use the newest version of fieldtrip. After the
>>     grandaverage there is no more 'avg' in the structure, so I can
>>     not go on in the tutorial e.g. with:
>>     GA_XvsY = GA_X;
>>     GA_XvsY.avg = GA_X.avg - GA_Y.avg;
>>
>>     New data is of structure:
>>
>>     label: {29x1 cell}
>>              time: [1x5000 double]
>>        individual: [10x29x5000 double]
>>            dimord: 'subj_chan_time'
>>               cfg: [1x1 struct]
>>
>>     Do I get the tutorial wrong or is it my data ?
>>     Thanks in advance
>>     Best
>>     Leopold
>>
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>
>
>
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-- 
Jörn M. Horschig
PhD Student
Donders Institute for Brain, Cognition and Behaviour
Centre for Cognitive Neuroimaging
Radboud University Nijmegen
Neuronal Oscillations Group

P.O. Box 9101
NL-6500 HB Nijmegen
The Netherlands

Contact:
E-Mail: jm.horschig at donders.ru.nl
Tel:    +31-(0)24-36-68493
Web: http://www.ru.nl/donders

Visiting address:
Trigon, room 2.30
Kapittelweg 29
NL-6525 EN Nijmegen
The Netherlands

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