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<p>Hi Eelke,</p>
<p><br>
</p>
<p>Thank you for helping. I am applying the High-Pass filter during my initial pre-processing (6 min resting state EEG data), here is my code for that:</p>
<p></p>
<div></div>
<p></p>
<div>cfg = [];<br>
cfg.dataset = file;<br>
cfg.padding = 0;<br>
cfg.channel = 'all'<br>
cfg.padtype = 'data';<br>
cfg.continuous = 'yes'<br>
cfg.hpfilter = 'yes'<br>
cfg.hpfreq = '1' <br>
cfg.trialdef.triallength = 1<br>
cfg = ft_definetrial(cfg);<br>
data_segmented_preproc= ft_preprocessing(cfg);</div>
<p><br>
</p>
<p><br>
</p>
<p>here is code for my plotting:</p>
<p></p>
<div>%%% PLOT TEST%%%%<br>
<br>
cfg = [];<br>
cfg.channel = 'eeg 014'<br>
ft_singleplotER(cfg,freqfourier)<br>
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<p></p>
<p><br>
</p>
<p>Figs are attached.</p>
<p><br>
</p>
<p>Thanks again,</p>
<p>Patrick<br>
</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> fieldtrip <fieldtrip-bounces@science.ru.nl> on behalf of Eelke Spaak <e.spaak@donders.ru.nl><br>
<b>Sent:</b> Thursday, April 25, 2019 2:27:24 AM<br>
<b>To:</b> FieldTrip discussion list<br>
<b>Subject:</b> Re: [FieldTrip] problem with combing high_pass filter and log transform</font>
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<font size="2"><span style="font-size:10pt;">
<div class="PlainText">Hi Patrick,<br>
<br>
Could you provide some more details? First, how are you applying the<br>
high-pass filter? Also, could you give the code you use for plotting<br>
and post the resulting figures?<br>
<br>
Best,<br>
Eelke<br>
<br>
On Sat, 20 Apr 2019 at 04:53, John Begnoche <jbegnoche@sralab.org> wrote:<br>
><br>
> Hello,<br>
><br>
><br>
> I am plotting outcomes from a frequency analysis of resting state sensor space EEG data, for the analysis I use the code below, and then plot with singleplotER, if I first high pass filter my data at 1Hz during a prepocessing step, my plotting shows no activity
until 35Hz then it spikes to a plateau for the rest of he higher frequencies, after a log transform I get a sine wave like shape. With no HP filter the data look like normal power spectrum data, why is the HP filter changing my data in this way?<br>
><br>
><br>
> cfg = [];<br>
> cfg.output = 'pow' ;<br>
> cfg.method = 'mtmfft';<br>
> cfg.pad = 'nextpow2';<br>
> cfg.taper = 'hanning';<br>
> cfg.foilim = [3 50]; %change for appropriate range of frequencies<br>
> % cfg.tapsmofrq = [2] ;<br>
> cfg.keeptrials = 'no';<br>
> %EEG_freq_segmented{i_run} = ft_freqanalysis(cfg, data_segmented_no_artifacts);<br>
> %EEG_freq_segmented{i_run} = ft_freqanalysis(cfg, data_segmented);<br>
> % freqfourier{i_run} = ft_freqanalysis(cfg, data_segmented_preproc_ICArm_no_artifacts);<br>
> freqfourier= ft_freqanalysis(cfg, data_segmented_no_artifacts);<br>
> %%%%%%log transform%%%%%%%%%%%%%<br>
> cfg = [];<br>
> cfg.parameter = 'powspctrm';<br>
> cfg.operation = 'log10';<br>
> freqfourier = ft_math(cfg, freqfourier);<br>
><br>
> Thank you,<br>
> Patrick<br>
><br>
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