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</head><body><p>Hi Mick,<br></p><p>I am not sure but maybe your problem results from your short baseline period (900ms) which is not long enough to resolve frequencies under 2.2 Hz (2 cycles). Have you tried to plot without baseline correction?<br></p><p>Best,<br></p><p>Anja<br></p><blockquote type="cite"><p>fieldtrip-request@science.ru.nl hat am 24. März 2016 um 12:00 geschrieben:<br><br><br>Send fieldtrip mailing list submissions to<br> fieldtrip@science.ru.nl<br><br>To subscribe or unsubscribe via the World Wide Web, visit<br> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip<br>or, via email, send a message with subject or body 'help' to<br> fieldtrip-request@science.ru.nl<br><br>You can reach the person managing the list at<br> fieldtrip-owner@science.ru.nl<br><br>When replying, please edit your Subject line so it is more specific<br>than "Re: Contents of fieldtrip digest..."<br><br><br>Today's Topics:<br><br> 1. Time Frequency Analysis of <1 Hz (Mick Lehmann)<br><br><br>----------------------------------------------------------------------<br><br>Message: 1<br>Date: Thu, 24 Mar 2016 10:48:57 +0100<br>From: Mick Lehmann <mick.lehmann@uzh.ch><br>To: fieldtrip@science.ru.nl<br>Subject: [FieldTrip] Time Frequency Analysis of <1 Hz<br>Message-ID: <686D5E56-B948-4C9C-9EAB-B56D8EF5F5D6@uzh.ch><br>Content-Type: text/plain; charset="utf-8"<br><br>Dear FT community,<br><br>I'm currently analyzing sleep EEG data and therefore I'm also interested in frequency ranges around 0.5/1 Hz. However, when I plot the data, it starts only from 1.25Hz and the cluster-based permutation can't be conducted when I include frequency ranges below 1.5 Hz. <br><br>Any ideas on this issue based on the information provided blow? <br><br>Best regards,<br>Mick<br><br>The raw data was read using the following script:<br><br>VP = dir('*.dat'); <br>cfg = [];<br>cfg.dataset = (VP.name); % dataset <br><br>cfg.trialdef.eventtype = 'Comment';<br>cfg.trialdef.prestim = 3;<br>cfg.trialdef.poststim = 5;<br> <br>cfg.trialdef.eventvalue = {'HitHitReakt_LL' 'GainReakt_LL'}; <br><br>cfg = ft_definetrial(cfg);<br><br>cfg.demean = 'yes';<br>cfg.baselinewindow = [-1 -.1];<br>HH_SlowOsc = ft_preprocessing(cfg);<br><br>HH_SlowOsc = renamechannels(HH_SlowOsc);<br><br>save HH_SlowOsc HH_SlowOsc<br><br><br><br>Afterwards, TF analysis was conducted using this script:<br><br> load HH_SlowOsc<br> <br><br> cfg = [];<br> cfg.channel = 'all';<br> cfg.method = 'wavelet';<br> cfg.with = 2; HERE, I'VE TRIED 2 AND 7 CYCLES. BOTH DIDN'T WORK<br> cfg.output = 'pow';<br> cfg.foi = 0.5:0.5:25; % Analysis from 2 to 30 Hz in 0.5 Hz steps<br> cfg.toi = -3:0.05:5; % time window "slides" from -1 to 2 sec in steps of 0.05 sec (50 ms)<br>% cfg.keeptrials = 'yes'; % f?r Single Trial Analysen<br><br> TF_HH_SlowOsc = ft_freqanalysis(cfg, HH_SlowOsc);<br> save TF_HH_SlowOsc TF_HH_SlowOsc; <br>-------------- next part --------------<br>An HTML attachment was scrubbed...<br>URL: <http://mailman.science.ru.nl/pipermail/fieldtrip/attachments/20160324/cbbeeb8b/attachment-0001.html><br><br>------------------------------<br><br>_______________________________________________<br>fieldtrip mailing list<br>fieldtrip@donders.ru.nl<br>http://mailman.science.ru.nl/mailman/listinfo/fieldtrip<br><br>End of fieldtrip Digest, Vol 64, Issue 30<br>*****************************************</p></blockquote></body></html>