[FieldTrip] Source reconstruction of combined EEG-MEG data

[Kenneth Shinozuka]

Dear Jan-Mathijs,

The leadfield code for the combined EEG-MEG data is now causing an error in
one of my subjects' data. Specifically, the following line:

[combined_headmodel{1}, combined_sens{1}] =
> ft_prepare_vol_sens(combined_headmodel{1}, combined_sens{1});


is triggering the error:

Warning: electrodes do not lie on skin surface -> using radial projection
> undoing the reject balancing for the gradiometer definition
> Error using ft_scalingfactor
> cannot convert V to unknown


Error in ft_scalingfactor (line 94)
>   factor = cellfun(@ft_scalingfactor, old(:), new(:));


Error in ft_apply_montage (line 337)
>   scale = ft_scalingfactor(input.chanunit, montage.chanunitold);


Error in undobalancing (line 37)
>     sens = ft_apply_montage(sens, sens.balance.(sens.balance.current),
> 'inverse', 'yes', 'keepunused', 'yes', 'warning', 'no');


Error in channelposition (line 34)
>   sens = undobalancing(sens);


Error in ft_prepare_vol_sens (line 628)
>   [pos, ori, lab] = channelposition(sens);


Do you know what the cause of this error could be? I explicitly set the
chanunit of elec, which is combined_sens{1}, to 'V', and the chantype of
elec to 'eeg', but the error still persists.

Best regards,
Kenneth


On Tue, Jan 14, 2025 at 6:59 AM Schoffelen, J.M. (Jan Mathijs) via
fieldtrip <fieldtrip at science.ru.nl> wrote:

> For reference:
>
> Hello Jan-Mathijs,
>
> Thank you very much for your reply. My apologies for not referring to the
> example code correctly. When I searched for the page on Google, Google
> indicated that the date of the page was December 4, 2024, hence I thought
> that it was published last month.
>
> I am able to get my own code running with ft_prepare_vol_sens, so I think
> you are right.
>
> Best regards,
> Kenneth
>
> On Mon, Jan 13, 2025 at 7:03 PM Schoffelen, J.M. (Jan Mathijs) via
> fieldtrip <fieldtrip at science.ru.nl> wrote:
>
>> Hi Kenneth,
>>
>> Please note that the documentation on the category ‘examples’ consist of
>> a collection of code/procedural descriptions that worked once-upon-a-time.
>> They are not guaranteed to be backward compatible with a further evolved
>> codebase.
>>
>> So, your statement ‘FieldTrip recently released some new documentation’
>>  is not fully appropriate. The example you refer to, is actually already
>> quite old; what may have changed is the name of the page (which may make it
>> look new), the content hasn’t changed. We are in the process of making some
>> important changes to the website (basically aimed at improving the browsing
>> experience), and for that reason we needed to refactor a bit the names of
>> the webpages under the hood.
>>
>> Regarding your question: I think that something has gone wrong at some
>> point when we executed some housekeeping operations on the
>> content-text-files that contain the information on the website. I believe
>> the proper function call should be ft_prepare_vol_sens, rather than
>> ft_prepare_headmodel_sens.
>>
>> Best wishes,
>> Jan-Mathijs
>>
>>
>> On 13 Jan 2025, at 12:51, Kenneth Shinozuka via fieldtrip <
>> fieldtrip at science.ru.nl> wrote:
>>
>> Hello,
>>
>> I am analyzing some simultaneously acquired EEG-MEG data. I saw that
>> FieldTrip recently released some new documentation about this:
>>
>> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.fieldtriptoolbox.org%2Fexample%2Fsourcerecon_meeg%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C4e32224c3f754fd3199a08dd349af212%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C638724563626187704%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C20000%7C%7C%7C&sdata=GjY8xDXESCZ1Hk%2FUqp5pAQ05TKWNTI6ZVBygQZzoANs%3D&reserved=0
>> <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.fieldtriptoolbox.org%2Fexample%2Fsourcerecon_meeg%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C4e32224c3f754fd3199a08dd349af212%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C638724563626210494%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C20000%7C%7C%7C&sdata=5%2BRzjA5jTgEarjCOoGmcAMtuNjd0qnZjiLQl4bGYYKw%3D&reserved=0>
>>
>> The provided code uses a function called “ft_prepare_headmodel_sens,”
>> which does not appear to exist. I get the error: “Unrecognized function or
>> variable ‘ft_prepare_headmodel_sens.’” Is there another function that you
>> intended to use?
>>
>> Best regards,
>> Kenneth
>> _______________________________________________
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>>
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>
>
> --
> Kenneth Shinozuka
> Harvard College '20 | BA in Neuroscience
> Oxford University '24 | PhD in Psychiatry
> +1 9493028589 (US, WhatsApp)
> +44 07572876618 (UK)
>
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-- 
Kenneth Shinozuka
Harvard College '20 | BA in Neuroscience
Oxford University '24 | PhD in Psychiatry
+1 9493028589 (US, WhatsApp)
+44 07572876618 (UK)
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