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<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">Hi,</span>
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My name is Tim Wanger, I am a graduate student working with Dean Sabatinelli at the University of Georgia. This is my first attempt at using Field Trip. In order to familiarize myself with the software and learn how it can analyze data collected at our lab,
I put together a small dataset containing fMRI timeseries from two different experimental conditions(arousing/not-<wbr>arousing). After looking through the documentation on the Field Trip website, I came to the conclusion that 'ft_timelockanalysis' could
be used to analyse timeseries data. After setting up a cfg variable, and importing my data(does not need preprocessing), I tried running ft_timelockanalysis, but there were some errors that I am not sure how to fix. I was wondering if anyone could help me
sort this out. </div>
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<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">data.label=region'; % region info</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">data.fsample=4; % 250ms sampling rate (4Hz)</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">data.trial=timeseriesdata; % our data, <158x50 cell> matrix. trials have already been excised from raw data</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">data.time=num2cell(1:length(</span><wbr style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;"><span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">timeseriesdata));
% represent time in samples</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">data.trialinfo=arousalrating'; % experimental condition information</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
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<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">cfg.channel='all';</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">cfg.trials= 'all';</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">cfg.covariance='no';</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">cfg.covariancewindow='all';</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">cfg.keeptrials='no';</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">cfg.removemean='yes';</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">cfg.vartrllength=2; % some trials are missing the 50th sample</span>
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Here is the error I am currently receiving, with some relevant Matlab command window output.</div>
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<div>the input is raw data with 1 channels and 158 trials</div>
<div>Warning: removing inconsistent sampleinfo </div>
<div>> In ft_datatype_raw at 109</div>
<div> In ft_checkdata at 213</div>
<div> In ft_timelockanalysis at 105</div>
<div> In testing_fieldtrip at 49</div>
<div>Warning: the data does not contain a trial definition </div>
<div>> In utilities/private/warning_once at 116</div>
<div> In utilities/private/<wbr>fixsampleinfo at 66</div>
<div> In ft_datatype_raw at 158</div>
<div> In ft_checkdata at 213</div>
<div> In ft_timelockanalysis at 105</div>
<div> In testing_fieldtrip at 49</div>
<div>Warning: reconstructing sampleinfo by assuming that the trials are consecutive segments of a continuous</div>
<div>recording </div>
<div>> In utilities/private/warning_once at 116</div>
<div> In utilities/private/<wbr>fixsampleinfo at 79</div>
<div> In ft_datatype_raw at 158</div>
<div> In ft_checkdata at 213</div>
<div> In ft_timelockanalysis at 105</div>
<div> In testing_fieldtrip at 49</div>
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<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">??? Index exceeds matrix dimensions.</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">Error in ==> fixsampleinfo at 95</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;"> offset(i) = time2offset(data.time{i}, data.fsample);</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">Error in ==> ft_datatype_raw at 158</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;"> data = fixsampleinfo(data);</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">Error in ==> ft_checkdata at 213</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;"> data = ft_datatype_raw(data, 'hassampleinfo', hassampleinfo);</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">Error in ==> ft_timelockanalysis at 105</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">data = ft_checkdata(data, 'datatype', {'raw', 'comp'}, 'feedback', 'yes', 'hassampleinfo', 'yes');</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">Error in ==> testing_fieldtrip at 49</span><br style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">
<span style="color: #222222; font-family: arial, sans-serif; font-size: 12.499999046325684px; background-color: #ffffff;">[timelock] = ft_timelockanalysis(cfg, data);</span>
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So, my questions are: </div>
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1. Am I on the right track? <br>
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2. Is there a better function to be using?</div>
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3. Am I using the proper data format as an import? </div>
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4. The code is 'assuming that the trials are consecutive segments of a continuous recording', which is not the case for me, so what can/should I do about that?</div>
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5. Does anyone have a template matlab script and demo dataset (for timeseries analysis) that runs without errors, that I could look at? It would help me to just step through the analysis to see what's happening, and an example of input data/parameters. </div>
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Thanks in advance!</div>
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-Tim Wanger<br>
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