[Eeglablist] newcrossf coherence matrix

Sacks, Annette E sacksae at upmc.edu
Wed Aug 5 09:21:24 PDT 2009


I've been doing a channel cross-coherence analysis in EEGlab v6.01b using newcrossf() with a sampling freq of 250Hz, epoch start/end [-400 1896], and frequency range [0 100], which outputs a 102 x 200 coherence matrix.  This is the call I used:

>> [coh,mcoh,timesout,freqsout,cohboot,cohangles] = pop_newcrossf(EEG, 1, 1, 2, [-400 1896], 0, 'freqs', [0 100], 'alpha', .05);

Which gives this output:

Adjust min freq. to 0.98 Hz to match FFT output frequencies Adjust max
freq. to 99.61 Hz to match FFT output frequencies Generating 200 time
points (-143.6 to 1639.6 ms) The window size used is 128 samples (512
ms) wide. Estimating 102 linear-spaced frequencies from 1.0 Hz to 99.6 Hz.

My question is: how do I calculate exactly how the time and frequency bins are being split up in the 102x200 (freq x time) coh matrix ?
ie, we don't know the exact beginning and ending time/frequency that is being collected in each entry of the coh matrix.

Thanks,
Annette Sacks
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