FW: [FIELDTRIP] Significance plot of TFR-Morlet

[Ingrid Nieuwenhuis]

Please always send replies to the list and not only to the person that
responded, so everyone can benefit and answer.



  _____

From: Amr Ayoub [mailto:amrgermany at yahoo.com]
Sent: Monday, August 03, 2009 4:13 PM
To: ingrid.nieuwenhuis at donders.ru.nl
Subject: Re: [FIELDTRIP] Significance plot of TFR-Morlet



Dear Ingrid,

Thanks for your fast reply.

Maybe I should rephrase my question.
I have used singleplotTFR with
cfg.basleine = [-1.8 1.8]
cfg.basleinetype='relative'
cfg.xlim=[-.5 .5]
cfg.ylim=[10 106]
cfg.zlim=[-1.8 1.8]
I see red spots corresponding to high gamma activity but I don't know if
they are significant or not. These red spots are scattered on different
channels, time points and frequencies.

Do you think taking 200 surrogate time points of the power spectrum assuming
a normal distribution of the surrogate power values, a significance
threshold can be calculated by two tailed test?



threshold = norminv([(1-alpha/2)],M,SD), where alpha=0.01, M=mean and SD =
standard deviation

Then subtract this threshold from the powerspctrm and last but not least use
singleplotTFR?

Thanks for your help.

Best regards,
Amr


Ps. To double check, is normalization applied to each frequency band in the
singleplotTFR?
Note: cf.maskparameter is a new option in singleplotTFR.

  _____

From: Ingrid Nieuwenhuis <ingrid.nieuwenhuis at DONDERS.RU.NL>
To: FIELDTRIP at NIC.SURFNET.NL
Sent: Monday, August 3, 2009 2:09:41 PM
Subject: Re: [FIELDTRIP] Significance plot of TFR-Morlet

Dear Amr,



>>From your question I can not make up what you already tried and where you
run into problems, so I'll give you some basic handles to info at the
FieldTrip wiki (and also  see the help of the functions below).



A nice overview on plotting functions in to be found in the plotting
Tutorial: http://fieldtrip.fcdonders.nl/tutorial/plotting



Did you try singleplotTFR, multiplotTFR or topoplotTFR with
cfg.maskparameter options? There is also clusterplot but see the mailinglist
posts that have been about that recently for limitations of clusterplot
(https://listserv.surfnet.nl/scripts/wa.cgi?A2=ind0907
<https://listserv.surfnet.nl/scripts/wa.cgi?A2=ind0907&L=fieldtrip&T=0&F=&S=
&P=4160> &L=fieldtrip&T=0&F=&S=&P=4160)



Hope this helps you further,



Ingrid



  _____

From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Amr Ayoub
Sent: Monday, August 03, 2009 1:33 PM
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] Significance plot of TFR-Morlet



Hi everyone,

How do I produce a significance plot of the "Time Frequency Representations
of power calculated using Morlet wavelets"?

Best regards,
Amr Ayoub



----------------------------------

The aim of this list is to facilitate the discussion between users of the
FieldTrip toolbox, to share experiences and to discuss new ideas for MEG and
EEG analysis.

http://listserv.surfnet.nl/archives/fieldtrip.html

http://www.ru.nl/fcdonders/fieldtrip/

----------------------------------

The aim of this list is to facilitate the discussion between users of the
FieldTrip toolbox, to share experiences and to discuss new ideas for MEG and
EEG analysis.

http://listserv.surfnet.nl/archives/fieldtrip.html

http://www.ru.nl/fcdonders/fieldtrip/




----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.
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