[Eeglablist] epoch for time frequency analysis

[Makoto Miyakoshi]

Dear Nico,

Hmm it sounds like you want to try both and take whichever you like. I also
sometimes face the question like this and need to make a decision, but
trying all the choices often tells me what I want to do.

Makoto

On Mon, Jan 18, 2016 at 3:03 AM, LEBAR Nicolas <
nicolas.lebar at etu.univ-amu.fr> wrote:

>
> Hi everyone,
>
> I'm looking for any advises for correctly epoch my EEG data. I need to
> epoch theses data for time frequency analysis (alpha, beta and gamma 50-80
> Hz). I have 3 condition that each least for 6 seconds. Theses conditions
> are continuous and separated by events that I don't want to include in the
> analysis, leading me to  do 3 separated windows, one for each condition. So
> I was thinking to 2 options to avoid the events:
> - epoch each condition from 2s to 4s after the event (cutting off 2s
> before and 2s after my windows off interest). So my analyzed window will be
> a 2s window.
> - or epoch each condition from 1s to 5s after the event (cutting off 1s
> before and 1s after my windows off interest). So my analyzed window will be
> a 4s window.
>
> Events are signal to process a movement for example.
>
> I wonder about the trade off : "longer window" or "longer cut off from the
> event I want to avoid". Any helps would be very appreciated.
> I hope this is clear enough.
>
> Regards,
>
> Nico
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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