[FieldTrip] Maxfilter SSS and TF-Plots
Frédéric Roux
f.roux at bcbl.eu
Mon Feb 22 20:03:50 CET 2016
Hi Robert,
in your preprocessing, did you use:
cfg.demean = 'yes';
If no then I suggest you take a look at this link:
http://www.fieldtriptoolbox.org/faq/why_does_my_tfr_look_strange
The stripe pattern could result from the DC-offset which gets removed when doing demeaning with the cfg-option.
Try something like this before feeding data into ft_freqanalysis.
cfg = [];
cfg.detrending = 'yes';
cfg.demean = 'yes';
[data] = ft_preprocessing(cfg,data);
Then use data with ft_freqanalysis.
HTH
Fred
--
FR
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---------------------------------------------------------------------------
From: "Seymour, Robert (Research Student)" <seymourr at aston.ac.uk>
To: "fieldtrip_mailinglist" <fieldtrip at science.ru.nl>
Sent: Monday, February 22, 2016 7:49:25 PM
Subject: [FieldTrip] Maxfilter SSS and TF-Plots
Dear all,
I've been trying out various cleaning parameters on Neuromag data and importing this into Fieldtrip. I've found that applying SSS to my data results in time-frequency plots with bands of activity at very specific frequencies. Image : http://i.imgur.com/QGma6qm.png . I do not believe it is anything to do with plotting because the lines disappear when I use tSSS with a .9 correlation. Has anybody else experienced this or hypothesise as to the cause of these artefacts?
Many thanks,
Robert Seymour (Aston Brain Centre)
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