[Eeglablist] 'timesout' in pop_newtimef

Bradley Voytek bradley.voytek at gmail.com
Thu Apr 1 16:04:55 PDT 2010


Jack:

You need a larger window. Because newtimef decomposes a signal using
different wavelet sizes depending on the frequencies of interest, the
lowest frequency, and padratio, determine the size of the edges of
your data.

Try a window from -200 - 400.

::brad



2010/3/31 余督督 <jackm_ustc at 163.com>:
> Hi experts,
>
> I am new to the time-frequency analysis of EEGLAB. I have a dataset of
> hundreds of epoch. The sampling rate is 500. Each epoch starts at -100ms and
> ends at 298ms. I'd like to see the ERSP of 10hz-50hz at the entire time
> range, i.e. -100-298ms. So I ran this command
>
> figure; [ersp,itc,powbase,times,freqs,erspboot,itcboot]=pop_newtimef( EEG,
> 1, 47, [-100 298], [3 0.5] ,'type', 'phasecoher', 'title','Channel P2 power
> and inter-trial phase coherence', 'alpha',.05,'padratio', 16,
> 'plotphase','off','freqs',[10 50],'timesout',[-100:2:298]);
>
> However, the output ERSP plot is always from 68ms to 130ms. And I saw a
> warning message in Matlab command window:
>
> Warning: 168 out of 200 time values were removed (now 68.00 to 130.00 ms) so
> the lowest
>          frequency could be computed with the requested accuracy
>
> And the output 'times' is indeed between 68 and 130
> times =
>   Columns 1 through 7   68.8485   70.8586   72.8687   74.8788   76.8889
> 78.8990   80.9091
>   Columns 8 through 14
>    82.9192   84.9293   86.9394   88.9495   90.9596   92.9697   94.9798
>   Columns 15 through 21
>    96.9899   99.0000   99.0000  101.0101  103.0202  105.0303  107.0404
>   Columns 22 through 28
>   109.0505  111.0606  113.0707  115.0808  117.0909  119.1010  121.1111
>   Columns 29 through 32
>   123.1212  125.1313  127.1414  129.1515
>
> What does this mean? And how can I get enough data at broader time range?
> I appreciate very much for any response.
>
> Jack
>
>
>
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