<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m trying to plot some data that I’ve just finished the analysis for, and was wondering if anyone had any advice on how it should be done. I’ve just done a frequency analysis (with a freq range of 5-80Hz) and a permutation based stats test on a set of EEG data, and it has come out with several significant clusters, but I’m not sure how to represent this visually. I tried using <span style='color:#1F497D'>ft_clusterplot </span>function, but it doesn’t seem to like multiple frequencies. Is there a way of making it plot only one frequency?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I was also wondering if it was possible to display the data in form of a short movie clip, showing something like a cube, with the x,y plane of the cube being a spatial representation/scalp map of the EEG data, and with the z plane representing the frequency range (in my case, 5-80Hz), and having the entire cube change with time.<o:p></o:p></p><p class=MsoNormal>This might be useful to help visualise the significant clusters, especially if the clusters could be plotted individually. Is this something that’s possible at all, or is there a better way of displaying the data?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Another problem that I keep on running into is when running the permutation based stats tests, I keep on getting out of memory errors. Currently I’m running Windows 7 64bit with Matlab 2011 64bit and have 4GB of physical RAM, but I’ve also assigned an additional 16GB of virtual RAM to help it along. This is what Matlab reports:<o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>Maximum possible array: 17666 MB (1.852e+010 bytes) *<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Memory available for all arrays: 17666 MB (1.852e+010 bytes) *<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Memory used by MATLAB: 509 MB (5.335e+008 bytes)<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Physical Memory (RAM): 4094 MB (4.293e+009 bytes)<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>* Limited by System Memory (physical + swap file) available.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>But even with 20GB of RAM assigned, I find that I can only do around 1000 permutations on my data set of 16 subjects, each with around 700 trials, 2 conditions, 75 frequencies, 260 time slices. Is there a way of increasing the limit on the number of permutations that I can run (without increasing the assigned amount of virtual RAM)? Or would it be better to just run a loop and calculate the stats at each frequency individually?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any help would be greatly appreciated. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Julian<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>