<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="auto">Hi John,<div dir="auto"><br></div><div dir="auto">You're specifying your cfg.hpfreq as a string ('1'), but it should be a number, so simply 1 without quotes.</div><div dir="auto"><br></div><div dir="auto">Cheers, Eelke </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 25 Apr 2019, 23:38 John Begnoche, <<a href="mailto:jbegnoche@sralab.org">jbegnoche@sralab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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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>
</div>
<p></p>
<p><br>
</p>
<p>Figs are attached.</p>
<p><br>
</p>
<p>Thanks again,</p>
<p>Patrick<br>
</p>
</div>
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<div id="m_7855883355840888089x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> fieldtrip <<a href="mailto:fieldtrip-bounces@science.ru.nl" target="_blank" rel="noreferrer">fieldtrip-bounces@science.ru.nl</a>> on behalf of Eelke Spaak <<a href="mailto:e.spaak@donders.ru.nl" target="_blank" rel="noreferrer">e.spaak@donders.ru.nl</a>><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>
<div> </div>
</div>
</div>
<font size="2"><span style="font-size:10pt">
<div class="m_7855883355840888089PlainText">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 <<a href="mailto:jbegnoche@sralab.org" target="_blank" rel="noreferrer">jbegnoche@sralab.org</a>> 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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