[Eeglablist] question about ITC/ERSP

[Stefon van Noordt]

Dear Pengmin,

As mentioned by Makoto, having the time vector of the output not being  
perfeclty uniformly distributed typically has little to no effect. The  
lack of uniformity is usually the result of the 'timesout' optional  
input defaulting to 200 data points.

However, if you want to ensure that the time vector is perfeclty  
uniformly distributed, you can set the 'timesout' output when running  
newtimef. In order to achieve a perfectly uniform distribution,  
timesout is equal to the sub-epoch window length (returned at the  
command line when running your newtimef) / srate*1000.

Hopefully that helps.

Best,

Stefon





Quoting PengMin Qin <qin.pengmin at gmail.com>:

> Dear all,
>
> I meet one question when I run the "study"- "pre-computer channel measures"
> to calculate the ITC and ERSP. The epoch is 1100ms, including 200ms
> pre-stimulus baseline.
> My parameters for ITC and ERSP is following:
>
> " 'cycles', [1 0.5], 'baseline', [-200 0], 'freqs', [3 4 5 6 7 8 9 10 11 12
> 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
> 38 39 40 41 42 43 44 45], 'alpha', 0.05".
>
> I test it, it works. But when I run it, I got one information:
> "Finding closest points for time variableTime values for time/freq
> decomposition is not perfectly uniformly distributed."
>
> I am not sure what it means. Are the parameters ok? or There are something
> wrong?
>
> Thank you very much!!
>
> Best,
> Pengmin
>