Dear Fieldtrip community,<div><br></div><div>I am working on localizing primary sensory responses using the beamformer technique. My subjects receive 'noisy' stimuli: tactile vibrations (0-100Hz frequncy content) to both index fingers, OR 1-2kHz auditory noise stimuli in both ears for 500 ms; I have 118 EEG channels and around 170 clean trials for each modality per subject to work with. My results look ok at the sensor level, but the sources look messy (for now...). </div><div><br></div><div>My question is: how accurately have you managed to beamformer-source-localize primary somatosensory/auditory responses - say, in a range from "not at all", "very vaguely/unreliably", "reasonably", "quite accurately"?</div><div><br></div><div>I just want to know how successful you guys have been so I know what to expect from EEG data, when to feel satisfied with the result I am getting.</div><div><br></div><div>Thanks a lot for your input!</div><div><br></div><div><br></div><div><br></div><div><br><br>On Wednesday, July 27, 2016, <<a href="mailto:fieldtrip-request@science.ru.nl">fieldtrip-request@science.ru.nl</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send fieldtrip mailing list submissions to<br>
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Today's Topics:<br>
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1. ft_databrowser error (Carmen Kung)<br>
<br>
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Message: 1<br>
Date: Wed, 27 Jul 2016 16:01:40 +1000<br>
From: Carmen Kung <<a href="javascript:;" onclick="_e(event, 'cvml', 'carmen.kung@mq.edu.au')">carmen.kung@mq.edu.au</a>><br>
To: <<a href="javascript:;" onclick="_e(event, 'cvml', 'fieldtrip@science.ru.nl')">fieldtrip@science.ru.nl</a>><br>
Subject: [FieldTrip] ft_databrowser error<br>
Message-ID: <<a href="javascript:;" onclick="_e(event, 'cvml', 'd5ef871e-c3f5-fae8-4bcd-96e67d3fde96@mq.edu.au')">d5ef871e-c3f5-fae8-4bcd-96e67d3fde96@mq.edu.au</a>><br>
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<br>
Dear fieldtripers,<br>
<br>
After running ft_definetrial and ft_preprocessing, we try to plot the<br>
data using ft_databrowser using the script at follow:<br>
<br>
<br>
>> cfg = [];<br>
>> ft_databrowser(cfg, data);<br>
<br>
But this is the error message we got:<br>
<br>
the input is raw data with 69 channels and 25 trials<br>
detected 0 visual artifacts<br>
Error using zeros<br>
Size inputs must be integers.<br>
<br>
Error in convert_event>artifact2artvec (line 179)<br>
artvec = zeros(length(artifact), endsample);<br>
<br>
Error in convert_event (line 103)<br>
obj = artifact2artvec(obj,endsample);<br>
<br>
Error in ft_databrowser (line 501)<br>
artdata.trial{1} = convert_event(artifact, 'boolvec', 'endsample',<br>
datendsample); % every artifact is a "channel"<br>
<br>
<br>
We did try to plot the raw *.cnt file (the cnt is recorded using curry<br>
7) using ft_databrowser. It worked, but not the epoched data. This is<br>
the parameters we used for the cfg to run ft_definetrial and<br>
ft_preprocessing<br>
<br>
cfg = [];<br>
cfg.dataformat = 'ns_cnt';<br>
cfg.headerformat= 'ns_cnt';<br>
cfg.eventformat= 'ns_cnt';<br>
cfg.trialdef.eventtype = 'stimtype';<br>
cfg.trialdef.prestim = 0.5;<br>
cfg.trialdef.poststim = 1.5;<br>
cfg.trialdef.eventvalue = 114;<br>
cfg.dataset = [dir filesep 'cnt' filesep subjectdata.subjectnr '_'<br>
subjectdata.initial '_' subjectdata.date '.cnt'];<br>
cfg = ft_definetrial(cfg);<br>
data = ft_preprocessing(cfg);<br>
<br>
The analysis is run on fieldtrip-20150522 and Matlab 2014a. Any help<br>
with this will be appreciated!<br>
<br>
Many thanks in advance,<br>
Carmen<br>
<br>
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End of fieldtrip Digest, Vol 68, Issue 28<br>
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</blockquote></div>