[FieldTrip] cluster>nothing to plot

[Zita Eva Patai]

Thank you Stephen & Lilla!

I think I am just a bit overwhelmed with my data...and I was hoping to get
straightforward results for my epoch...


On Fri, Oct 7, 2011 at 2:08 PM, Magyari, Lilla <Lilla.Magyari at mpi.nl> wrote:

> hi Zita,
>
> I do not know what kind of script you wrote, therefore, it is difficult to
> figure out what the problem is exactly. But your problems reminds me to the
> following:
> if you followed the FT tutorial for plotting the clusters, you must be
> aware that it will plot only those channels in each time-bin that are part
> of the cluster during the entire time-bin. So, if you use a 50 ms bin, and a
> channel is part of the significant cluster only for 10 ms, you won't see
> that channel on the plot. I hope this helps.
>
> Best,
> Lilla
>
>
> Zita Eva Patai wrote:
>
>> Sorry, I know the answer now, but I have another , similar problem:
>>
>> When i get the clusterplot figure (after i run the cluster analysis), it
>> has the timebins every 4ms (bc i have a 250Hz sampling rate) with the
>> significant clusters plotted. For a simplified plotting, i was trying to use
>> the bit of script where i can specify the timesteps i want the clusters to
>> be shown in (ex: every 50ms)
>> But, depending on what timestep i use, sometimes it does not display the
>> clusters that are significant, almost like if the period is not long enough,
>> it will not show the clusters...
>>
>> Any ideas ?
>>
>> Thank you!
>>
>> On Fri, Oct 7, 2011 at 10:18 AM, Zita Eva Patai <eva.patai at psy.ox.ac.uk<mailto:
>> eva.patai at psy.ox.ac.uk**>> wrote:
>>
>>    Dear All
>>
>>    I am running the Cluster-based permutation tests on event related
>>    fields, and for the same dataset, with all settings identical, when
>>    i run:
>>    0-200ms: i get one significant cluster
>>    but:
>>    0-500ms: no significant clusters
>>
>>    why does my significant cluster disappear depending on the time
>>    window i use?
>>
>>    thank you!
>>    z
>>
>>
>>    --
>>    Zita Patai
>>    DPhil Candidate, Experimental Psychology
>>    University of Oxford
>>    bcl.psy.ox.ac.uk/people/zita-**eva-patai/<http://bcl.psy.ox.ac.uk/people/zita-eva-patai/>
>>    <http://bcl.psy.ox.ac.uk/**people/zita-eva-patai/<http://bcl.psy.ox.ac.uk/people/zita-eva-patai/>
>> >
>>    eva.patai at psy.ox.ac.uk <mailto:eva.patai at psy.ox.ac.uk**>
>>
>>
>>
>>
>>
>>
>> --
>>
>> Zita Patai
>> DPhil Candidate, Experimental Psychology
>> University of Oxford
>> bcl.psy.ox.ac.uk/people/zita-**eva-patai/<http://bcl.psy.ox.ac.uk/people/zita-eva-patai/><
>> http://bcl.psy.ox.ac.uk/**people/zita-eva-patai/<http://bcl.psy.ox.ac.uk/people/zita-eva-patai/>
>> >
>> eva.patai at psy.ox.ac.uk <mailto:eva.patai at psy.ox.ac.uk**>
>>
>>
>>
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>
> --
> PhD student
> Language and Cognition Group
> research assistant
> Neurobiology of Language Group
>
> Max Planck Institute for Psycholinguistics
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-- 

Zita Patai
DPhil Candidate, Experimental Psychology
University of Oxford
bcl.psy.ox.ac.uk/people/zita-eva-patai/
eva.patai at psy.ox.ac.uk
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