[FieldTrip] Estimate coherence between conditions?

[Maria Hakonen]

Hi Maité,

Thank you for your answer!

I have managed to calculate the coherence between two conditions in
the sensor space in the way you suggested. However, I haven't managed
to calculate the coherence between conditions in the source space
(i.e. Appendix 1 in
http://www.fieldtriptoolbox.org/tutorial/coherence). ft_sourceanalysis
doesn't have channelcmb. I wonder if anyone has any solutions for
this?

BTW. I didn't get the answer to my question in my email but found it
from Fieldtrip archive. However, I have also got some other emails
from fieldtrip discussion forum.

Best,

Maria


Hi Maria,
Here it is a possible solution. First, rename channels from one of
both conditions: for example, for condition 2, {'ch01cond2',
'ch02cond2', ...}. Then, append the data from both conditions. In
ft_freqanalysis introduce all the channels combinations you want:

cfg.channel    = {'MEG' 'ch01cond2' 'ch02cond2' ...};
cfg.channelcmb = {'ch01' 'ch01cond2'; 'ch02' 'ch02cond2'};
As I understand, you could use the same channelcmb later on in
ft_connectivityanalysis.
I hope it helps.
Best wishes,Maité



Dear FieldTrip experts,

I have just started to use Fieldtrip and would like to estimate coherence
between MEG responses measured in two different conditions from the same
cortical areas. The example in Appendix 1 is close to what I would like to
do:
http://www.fieldtriptoolbox.org/tutorial/coherence

However, in the example, coherence is calculated between the reference
signal (EMG) and all MEG channels. Could it be possible to calculate
coherence between each MEG channel in one condition and the same MEG
channels in the other condition, that is:
ch1 in cond1 vs. ch1 in cond2, ch2 in cond1 vs. ch2 in cond2, ...

As far as I understand, the example in Appendix 1 would do this:
ch1 in cond1 vs. all channels in cond2, ch2 in cond ch1 all channels in
cond2, ...

Best,
Maria
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