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<p class="MsoNormal">I am trying to learn how to apply the LCMV beamformer to EEG data. To that end I am starting to go through this tutorial:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="http://www.fieldtriptoolbox.org/tutorial/beamformer_lcmv?s%5b%5d=lcmv">http://www.fieldtriptoolbox.org/tutorial/beamformer_lcmv?s[]=lcmv</a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">I downloaded the data from this link:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">The ft_definetrial and ft_preprocessing functions require the original MEG dataset, which is available
from <a href="ftp://ftp.fieldtriptoolbox.org/pub/fieldtrip/tutorial/SubjectSEF.zip" title="">
<span style="color:blue">ftp://ftp.fieldtriptoolbox.org/pub/fieldtrip/tutorial/SubjectSEF.zip</span></a>.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">Then I tried this code:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">% find the interesting segments of data<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">cfg = [];<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">cfg.dataset = 'SubjectSEF.ds';<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">cfg.trialdef.eventtype = 'Blue';<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">cfg.trialdef.prestim = .1; % .1 sec prior to trigger<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">cfg.trialdef.poststim = .2; % .2 sec following trigger<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">cfg.continuous = 'yes';<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">cfg = ft_definetrial(cfg);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal">and got this output:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Warning: could not determine filetype of SubjectSEF.ds <o:p>
</o:p></p>
<p class="MsoNormal">> In ft_filetype (line 1294)<o:p></o:p></p>
<p class="MsoNormal"> In dataset2files (line 42)<o:p></o:p></p>
<p class="MsoNormal"> In ft_checkconfig (line 557)<o:p></o:p></p>
<p class="MsoNormal"> In ft_definetrial (line 131)<o:p></o:p></p>
<p class="MsoNormal"> In fieldtrip_test_lcmv (line 13) <o:p></o:p></p>
<p class="MsoNormal">Warning: no trialfun was specified, using ft_trialfun_general
<o:p></o:p></p>
<p class="MsoNormal">> In ft_definetrial (line 138)<o:p></o:p></p>
<p class="MsoNormal"> In fieldtrip_test_lcmv (line 13) <o:p></o:p></p>
<p class="MsoNormal">evaluating trialfunction 'ft_trialfun_general'<o:p></o:p></p>
<p class="MsoNormal">Error using ft_read_header (line 2248)<o:p></o:p></p>
<p class="MsoNormal">unsupported header format "unknown"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Error in ft_trialfun_general (line 78)<o:p></o:p></p>
<p class="MsoNormal">hdr = ft_read_header(cfg.headerfile, 'headerformat', cfg.headerformat);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Error in ft_definetrial (line 177)<o:p></o:p></p>
<p class="MsoNormal"> [trl, event] = feval(cfg.trialfun, cfg);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Error in fieldtrip_test_lcmv (line 13)<o:p></o:p></p>
<p class="MsoNormal">cfg = ft_definetrial(cfg);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So I am totally lost here. Any suggestions?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">-Jeff Eriksen<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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