[Eeglablist] ERSP Time duration

[Arnaud Delorme]

Dear Hamed,

When you perform spectral estimation using a sliding window (as this is done for ERSP decompositions), the time of the first spectral estimate corresponds to the center of that window used to compute that spectral estimate. If your window is 500 ms and your epoch start at -1 second and end at 3 seconds, then your spectral decomposition will start at about -750 ms and end at 2750 ms.

Best wishes,

Arno

> On Jun 30, 2018, at 7:59 PM, Hamed Taheri <hamedtaheri at yahoo.com> wrote:
> 
> Dear all,
> 
> I have 20 subjects EEG signals and I've selected an epoch for each subject which its duration is 4 sec ( -1 sec baseline and 3 sec after stimulus). I've created a study to compute ERSP but I don't know why time duration of the computed ESRP is just between 671.0 to 1327.0 ms. I've changed the cycle which was [3 0.8] to [1 0.8] and the ERSP time duration changed to -443.0 to 2441.0 ms but still, it's not what I need for my analysis. 
> Could you please let me know how can I have the ERSP of all after stimulus part (3000 ms) and what parameters must be changed to get my desired result. 
> My current Time/freq parameters are: 'cycles', [1 0.5],'freqs',[1 45], 'nfreqs', 100, 'ntimesout', 200
> 
> Best Regards,
> Hamed
> 
> 
> 
> 
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