[Eeglablist] 'timesout' in pop_newtimef
余督督
jackm_ustc at 163.com
Wed Mar 31 16:21:26 PDT 2010
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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