[Eeglablist] Induced power from wavelet

matt schalles matt.schalles at gmail.com
Wed Jan 25 17:45:30 PST 2017


Hi Nancy, et al.

It is my understanding that the way EEGlab calculates ERSPs, the
time-frequency transform is done prior to temporal averaging of trials,
which should give you the induced activity, without having to do additional
subtractions.

cheers,

Matt Schalles, Ph.D.
Cognitive Neuroscientist, VA Health System
Visiting Assistant Professor, Mills College

On Tue, Jan 24, 2017 at 6:00 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

> Dear Nancy,
>
> I don't quite understand the question, but I guess that you want to know
> how you deal with ERSP most straightforwardly? I think you use newtimef()
> function, and visualize the first output as
>
> figure
> imagesc(output); axis xy
>
> The basic figure is this. Then you change xaxis labels, yaxis labels, etc.
> Do not forget to use eegh(); you perform an operation from GUI first, then
> type eegh() to obtain the code executed.
>
> Makoto
>
> On Sun, Jan 22, 2017 at 3:01 PM, Lundin, Nancy B. <nlundin at indiana.edu>
> wrote:
>
>> ​Hello list,
>>
>>
>> I would like to calculate the induced ERSP in my data. I planned to run
>> the wavelet decomposition on my data to calculate total power, and then
>> separately run a wavelet over the averaged data to get the evoked activity,
>> and then subtract the evoked from the total to get induced activity.
>> However, when I manually average the trials, I get an error message when
>> attempting to save my EEG datasets saying that the number of epochs in the
>> data structure is not the same as the number of epochs in the data (which
>> makes sense, since I averaged).
>>
>>
>> I was wondering if there was a more direct way to calculate induced ERSP
>> in EEGLAB rather than this manual subtraction method?
>>
>>
>> Thank you,
>>
>> Nancy
>>
>>
>> *Nancy Lundin*
>> *Doctoral Student, Clinical Psychology & Neuroscience*
>> Indiana University Bloomington
>> Department of Psychological & Brain Sciences
>> 1101 East 10th St.
>> Bloomington, IN 47405
>>
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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