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Hi:
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>I am having trouble getting the frequency bands for my EEG data. All my different EEG frequency plots (for channel 1) come out the same as the original unfiltered EEG :</div>
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<div class=""><img height="352" width="681" apple-width="yes" apple-height="yes" apple-inline="yes" id="F7F6EE76-8848-412B-A4EA-475CA0C225BD" src="cid:E9FC888B-B6C1-4CA4-9966-5F9DB37D24E7" class=""></div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>I’d appreciate all tips on what I am doing wrong. Here is my partial script for the first 3 plots:</div>
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addpath /path/to/fieldtrip</div>
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ft_defaults</div>
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% 1. EEG</div>
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disp ( 'EEG...' )</div>
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cfg = [];</div>
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cfg.dataset = '1.fif';</div>
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data = ft_preprocessing ( cfg );</div>
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disp ( 'Getting eeg channels...' )</div>
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eeg_channels = ft_channelselection ( 'EEG*', data.label );</div>
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cfg = [];</div>
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cfg.channel = eeg_channels;</div>
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eeg = ft_selectdata ( cfg, data );</div>
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disp ( 'Saving eeg...' )</div>
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save eeg.mat eeg -v7.3;</div>
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clearvars cfg eeg;</div>
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% 2. Low delta EEG</div>
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disp ( 'Low delta EEG...' )</div>
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cfg = [];</div>
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cfg.bgfilter = 'yes';</div>
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cfg.bpfreq = [0.1 2];</div>
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cfg.dataset = '1.fif';</div>
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data = ft_preprocessing ( cfg );</div>
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cfg = [];</div>
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cfg.channel = eeg_channels;</div>
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cfg.frequency = [0.1 2];</div>
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eeg = ft_selectdata ( cfg, data );</div>
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disp ( 'Saving low delta eeg...' )</div>
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save low_delta_eeg.mat eeg -v7.3;</div>
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clearvars cfg eeg;</div>
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% 3. Delta EEG</div>
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disp ( 'Delta EEG...' )</div>
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cfg = [];</div>
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cfg.bgfilter = 'yes';</div>
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cfg.bpfreq = [2 4];</div>
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cfg.dataset = '1.fif';</div>
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data = ft_preprocessing ( cfg );</div>
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cfg = [];</div>
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cfg.channel = eeg_channels;</div>
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cfg.frequency = [2 4];</div>
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eeg = ft_selectdata ( cfg, data );</div>
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disp ( 'Saving delta eeg...' )</div>
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save delta_eeg.mat eeg -v7.3;</div>
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clearvars cfg eeg;</div>
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<div class=""><span class="Apple-tab-span" style="white-space:pre"></span>Thanks!</div>
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<div class="">Mona</div>
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Mona Wong<br class="">
Web & Mobile Application Developer<br class="">
San Diego Supercomputer Center<br class="">
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"I've learned that people will forget
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<div class=""> forget how you made them feel."</div>
<div class=""> --- Maya Angelou<br class="">
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