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Dear community,
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<div>My name is Inês and I'm using fieldtrip to look at EEG data acquired from a 32-channel BioSemi using BCI2000 in my BCI experiment. </div>
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<div>Currently I have been looking at the alpha band power over averaged trials in a particular condition, and to do that I have been using both ft_topoplotER and ft_multiplotER (). </div>
<div>My problem is that although my data has 32 channels (all specified under <span style="font-family: Lucida Console">
data.label</span>), both plots only display a few main channels - 20 to be exact.</div>
<div>I'm including an example image of the layout and the corresponding topoplot. The same channels are shown in multiplot. Here's my code:</div>
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<div><span style="font-family: Lucida Console">%preprocessing for each subject and extracting desired trials%</span></div>
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<div><span style="font-family: Lucida Console">cfg=[];</span></div>
<div><span style="font-family: Lucida Console">data_alltrials = ft_appenddata(cfg, data{:});</span></div>
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<div><span style="font-family: Lucida Console">% FFT</span></div>
<div><span style="font-family: Lucida Console">freq_cfg = [];</span></div>
<div><span style="font-family: Lucida Console">freq_cfg.channel = 'all';</span></div>
<div><span style="font-family: Lucida Console">freq_cfg.method = 'mtmfft';</span></div>
<div><span style="font-family: Lucida Console">freq_cfg.output = 'pow';</span></div>
<div><span style="font-family: Lucida Console">freq_cfg.taper = 'hanning';</span></div>
<div><span style="font-family: Lucida Console">freq_cfg.keeptrials = 'yes';</span></div>
<div><span style="font-family: Lucida Console">freq_cfg.foi = foi;</span></div>
<div><span style="font-family: Lucida Console">freq_cfg.tapsmofrq = 1;</span></div>
<div><span style="font-family: Lucida Console">fft_alltrials = ft_freqanalysis(freq_cfg, data_alltrials);</span></div>
<div><span style="font-family: Lucida Console">disp('Preprocessing done.');</span></div>
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<div><span style="font-family: Lucida Console">cfg = []; cfg.layout = layout;</span></div>
<div><span style="font-family: Lucida Console">layout = ft_prepare_layout(cfg, data_alltrials);</span></div>
<div><span style="font-family: Lucida Console">ft_layoutplot(cfg, data_alltrials)</span></div>
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<div><span style="font-family: Lucida Console">cfg = [];</span></div>
<div><span style="font-family: Lucida Console">cfg.layout = 'biosemi32.lay';</span></div>
<div><span style="font-family: Lucida Console">channel = ft_channelselection({'all'},data_alltrials.label);</span></div>
<div><span style="font-family: Lucida Console">cfg.channel = channel;</span></div>
<div><span style="font-family: Lucida Console">cfg.colorbar = 'yes';</span></div>
<div><span style="font-family: Lucida Console">cfg.showlabels = 'yes';</span></div>
<div><span style="font-size: 10pt;line-height: 1.5"><span style="font-family: Lucida Console">figure(); ft_topoplotER(cfg, fft_alltrials); </span></span></div>
<div><span style="font-size: 10pt;line-height: 1.5"><span style="font-family: Lucida Console">figure(); ft_multiplotER(cfg, fft_alltrials);</span></span></div>
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<div>So I guess my question is: is there a way to change the density of electrodes plotted, or even show them all?</div>
<div>Can someone tell me if there is something wrong with the cfg settings I use or if I am doing something wrong at any other place? </div>
<div>Looking forward to hear from you all!</div>
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<div>Best,</div>
<div>Inês</div>
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