Hello, <br>I have a question about the EEGLAB cross-channel coherence figure. Coherence is major interest in my contemplated study so quantitative coherence results are quite important. <br><br>I am using EEGLAB v7.1.3.13b, downloaded in compiled form. After loading a data set, identifying channel locations, I go to Plot>time-frequency transforms>Channel cross-coherence and get a figure plotted. The lower portion of the figure seems to give spectral power as a function of frequency and elapsed time during the epoch. Spectral power seems to be measured in some unspecified units [-180,180]. What are these units? <br>
<br>Of most interest: the top portion of the figure is quite mysterious. What data are plotted as a joint function of frequency and time? The color bar units 7.25644e+006 to 2.90258e+007 are also unspecified -- what are they? A small plot at the left seems to show frequency as a function of *something* that ranges from 0 to 2<br>
<br>Finally, the small plot at the bottom apparently shows coherence as a function of time? The little left-side ordinate label is coh. X 10^6; on the right it is coh. X 10^7<br>Is it possible to get quantitative measures of coherence output from EEGLAB? Where? How? <br>
<br><br>I will be grateful for any help. Maybe there is an explanation with more detail than is contained in the EEGLAB WIKITORIAL.<br><br>Thank you<br><br>-- <br><br>Don Scott<br>(864) 415 - 1795<br>Dscott8201@Gmail.Com<br>
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<font face="arial, sans-serif"><i><span style="font-size:x-small"><br></span></i></font></div><div><font face="arial, sans-serif"><i><span style="font-size:x-small">--- Stephen Hawking</span></i></font></div></div><br>