[Eeglablist] Plotting frequency average by channel

[Arnaud Delorme]

Dear Zach,

if you are using STUDY, you may use the 'timerange' option in the spectral option edit box to restrict computing spectrum on a specific time range (see  help std_spec for more information). If you have a single dataset, this option is not available though in the graphical interface.

Note that you may create a STUDY using one dataset only.
Hope this helps,

Arno

On Aug 29, 2012, at 11:50 AM, Makoto Miyakoshi wrote:

> Dear Zach,
> 
> I assume you mean average power/amplitude of frequencies. I don't
> think there is any GUI supported way to do this, so you have to write
> a code. The code should be something like this.
> 
> 1. Filter the data (e.g. 8-13 Hz bandpass)
> 2. Hilbert transform, namely EEG.data = abs(hilbert(EEG.data));
> 3. Calculate the mean of the period, namely tmp = mean(EEG.data(:,
> t1:t2, :)); where t1 and t2 are start and end of your specified
> period.
> 4. topoplot(tmp, EEG.chanlocs);
> 
> The process 1 and 2 could be replaced with wavelet transform
> (newtimef) which you may want to try too. I don't know which method
> produces better results.
> 
> If you have more questions, please let us know.
> 
> Makoto
> 
> 2012/8/28 Zach Sheffler <zach.sheffler at ttiltd.net>:
>> Hello -
>> 
>> I am looking to plot the average frequency over some specified period by
>> epoch (e.g., from time 0 to time +500ms) for all channels on a map.
>> Unfortunately, consulting the EEGLab wiki hasn't been much help. Is this
>> possible, and if so, what is the method that would make this possible?
>> 
>> Thanks kindly for any assistance.
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> 
> 
> 
> -- 
> Makoto Miyakoshi
> JSPS Postdoctral Fellow for Research Abroad
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
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