[Eeglablist] Cross Channel Coherence analysis

[Makoto Miyakoshi]

Dear Xue,

> I want to know whether could I just treat different channels as different
trials in the newtimef.

Yes. EEGLAB also has crosstimef() function which you want to check out
(there is GUI menu for it too).

> And another question is whether the ITC values of different conditions
could be averaged all subtracted directly.

A problem in comparing ITC measures across condition/subjects is that the
signal to noise ratio depends on the number of trials. If you compare
30-trial average and 100-trial average, you'll see significant difference
allover the plot because 'background' ITC SNR is very different and
interestingly event-related phase modulation is left as nonsignificant! So
I would suggest that for fair comparison you do something like subsampling
to have the same number of trials across conditions for ITC (which people
don't do very often though).

Makoto


2014-05-09 8:10 GMT-07:00 张雪 <zhangxue at psych.ac.cn>:

>
>
> Dear all
>        I'm trying to do cross-channel coherence which is similar to the
> inter-trial coherence. I want to know whether could I just treat different
> channels as different trials in the newtimef. And another question is
> whether the ITC values of different conditions could be averaged all
> subtracted directly. Has there anybody ever done this through EEGlab before?
> Thanks
> Zhang Xue
> Psychological institute,
> Chinese Academy of Science
>
>
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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