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<font face="Georgia">Hi Katy,<br>
<br>
how did you convert your motion data into BIDS? We have a set of
resources on how to correctly <i>bidsify </i>the data <a
href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjuliuswelzel.github.io%2Fmotion_bids_materials_jw%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C2c01718bb9484aeaacda08ddd90a01b9%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C638905359214679918%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=y57HPjW59aXoMsFB3%2FehiCwm59BHeMYTWGhC4sTxxXw%3D&reserved=0" originalSrc="https://juliuswelzel.github.io/motion_bids_materials_jw/">overview
</a>and <a
href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fsjeung%2Fmultimodal_XDF-to-BID%2Fblob%2Fmain%2FMoBIDS_handson_1_xdf2bids.m&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C2c01718bb9484aeaacda08ddd90a01b9%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C638905359214699687%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Vd%2Bv3RJiudevJ5flnekD3PPVrXTuDmmBg3iOJKSVZvg%3D&reserved=0" originalSrc="https://github.com/sjeung/multimodal_XDF-to-BID/blob/main/MoBIDS_handson_1_xdf2bids.m">example</a>.<br>
<br>
What do you intend to do with the motion data in fieldtrip if I
may ask? The toolbox is not designed for motion data, however
there are a few processing steps which might be meaningful to run.
If you have any questions, please reach out to us :)<br>
<br>
Best<br>
Julius<br>
</font><br>
<div class="moz-cite-prefix">Am 11.08.2025 um 18:02 schrieb Cross,
Kathryn A. via fieldtrip:<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal"><span style="font-size:11.0pt">I am trying
to load BIDS formatted motion data and am unsure of the
correct way to do this.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">When I try
to use ft_read_data I am receiving the below error.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Is my input
wrong? It seems to be trying to read a tsv file as a json in
line 317 of ft_read_header. I have tried a few variations of
headerformat and dataformat arguments without success.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thank you in
advance for any advice!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Katy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">data =
ft_read_data(‘sub-CM01_task-reaching_tracksys-apdm_run-1_motion.tsv’,’dataformat’,’bids_tsv’);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal">208 [filename, headerfile, datafile] =
dataset2files(filename, dataformat);<o:p></o:p></p>
<p class="MsoNormal">found matching BIDS sidecar
'G:\PROJECTS\Cueing_Noninvasive\data\bids\sub-CM01\motion\sub-CM01_task-reaching_tracksys-apdm_run-1_motion.tsv'<o:p></o:p></p>
<p class="MsoNormal">reading
'G:\PROJECTS\Cueing_Noninvasive\data\bids\sub-CM01\motion\sub-CM01_task-reaching_tracksys-apdm_run-1_motion.tsv'<o:p></o:p></p>
<p class="MsoNormal">Error using loadjson>error_pos<o:p></o:p></p>
<p class="MsoNormal">JSONLAB:JSON:InvalidFormat: Outer level
structure must be an object or an array: 3<error><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Error in loadjson (line 143)<o:p></o:p></p>
<p class="MsoNormal"> pos=error_pos('Outer level
structure must be an object or an array',inputstr,pos);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Error in ft_read_json (line 45)<o:p></o:p></p>
<p class="MsoNormal"> json = loadjson(filename);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Error in ft_read_header (line 317)<o:p></o:p></p>
<p class="MsoNormal"> data_json = ft_read_json(sidecar);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Error in ft_read_data (line 223)<o:p></o:p></p>
<p class="MsoNormal"> hdr = ft_read_header(filename,
'headerformat', headerformat, 'checkmaxfilter',
checkmaxfilter, 'password', password, 'cache', cache);<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<br>
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<pre class="moz-signature" cols="72">--
Julius Welzel
University of Kiel
Department of Neurology, UKSH Campus Kiel
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