<html><head><style>p{margin-top:0px;margin-bottom:0px;}</style></head><body><div style="font-size:10pt; font-family:Gulim;"><span style="font-size: 10pt;"></span><!-- --><div style="font-size:10pt; font-family:Gulim;"><p>Dear community,</p><p><br><!-- --></p><p><span style="font-size: 10pt; line-height: 1.5;">My name is Ahn Min-Hee and I am working in the mindbrain lab in korea university, south koera</span> </p><div style="font-size:10pt; font-family:Gulim;"><p><span style="font-size: 10pt;">on invasive BMI.</span></p><p>Currently I am analyzing EEG data of our lab project, where we processed using our time-frequency</p><p>analysis method on matlab. It's sourcing from Brain Vision Recorder.</p><p> </p><p>I tried using ft_crossfrequency() to assess time-frequency aspects of our data.</p><p>First, I tried importing our own data that formed 3D type by frequency x time x channel,</p><p>but I don't know how it convert the fieldtrip style data structure.</p><p>Specially, about converting epoch dimension & constructing trial struct... </p><p> </p><p>So, I tried <span style="font-size: 13.3333px; line-height: 1.5;">additional</span><span style="font-size: 13.3333px; line-height: 1.5;"> </span><span style="font-size: 10pt; line-height: 1.5;">work as initiation. I import raw data such as *.eeg from Brain Vision Recorder.</span></p><p>I work following:</p><p> </p><p>>> cfg = [] ; </p><p>>> cfg.dataset='SSVEP_NEW_su0001.eeg'; </p><p>>> cfg.trialdef.eventtype='?'; </p><p>>> [cfg] = ft_definetrial(cfg); </p><p> </p><p>Warning: no trialfun was specified, using ft_trialfun_general </p><p>> In ft_definetrial (line 135) </p><p>evaluating trialfunction 'ft_trialfun_general'</p><p>reading the events from 'SSVEP_NEW_su0001.vhdr'</p><p>the following events were found in the datafile</p><p>event type: 'Comment' with event values: 'actiCAP Data On' </p><p>event type: 'New Segment' with event values: </p><p>event type: 'Stimulus' with event values: 'S 11' 'S 12' 'S 13' 'S 14' 'S 15' 'S 16' 'S 21' 'S 22' 'S 23' 'S 24' 'S 25' 'S 26' 'S 28' 'S111' 'S112' 'S113' 'S114' 'S115' 'S116' 'S121' 'S122' 'S123' 'S124' 'S125' 'S126' 'S127' </p><p>no trials have been defined yet, see FT_DEFINETRIAL for further help</p><p>found 943 events</p><p>created 0 trials</p><p>the call to "ft_definetrial" took 0 seconds and required the additional allocation of an estimated 0 MB</p><div> </div><div>Then... I don't know that its result is correct or not... also, how treat warning & why resulting trial to 0.</div><div> </div><div>-----</div><div> </div><div>So, I summarize my question:</div><div> </div><div>1. How convert/construct our own data format(freq x time x channel) to fieldtrip type data struct ? </div><div>2. What or where detailed example for ft_crossfrequency() function ?</div><div>3. How import *.eeg(brain vision raw data) ? Especially treat a trial information ?</div><div> </div><div>I uploaded our data formed file o a filehoster such as fieldtriptoolbox ftp site as it exceeds the </div><div>critical file size of 1 MB. Here is the link:</div><div>ftp://ftp.fieldtriptoolbox.org/pub/incoming/TiGoum_USIL.FREQxTIMExCHANNEL.mat </div><div> </div><div>Can someone tell me above questions. Any help world be appreciated.</div><div><span style="font-size: 10pt; line-height: 1.5;">Thank you very much.</span> </div><div><span style="font-size: 10pt; line-height: 1.5;"> </span></div><div><span style="font-size: 10pt; line-height: 1.5;">Best,</span></div><div><span style="font-size: 10pt; line-height: 1.5;"> </span></div><div><span style="font-size: 10pt; line-height: 1.5;">Ahn Min-Hee.</span></div><div><span style="font-size: 10pt; line-height: 1.5;"> </span></div></div>
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