[FieldTrip] Source reconstruction - low-rank leadfield

[Diego Lozano-Soldevilla]

Dear Tibor and FieldTrippers
I'm in the same situation. I excluded those positions but now I'm wondering
whether this was a good decision. If somebody know what's happening and how
to fix this, please drop a line!
Yours sincerely,
Diego



On Mon, 19 Oct 2020 at 20:17, <tibor.auer at gmail.com> wrote:

> Dear FieldTrippers,
>
>
>
> I have some questions regarding source reconstruction.
>
>
>
> We use eLORETA, which runs fine for most participants, however, I receive
> this error message for quite a few:
>
>
>
> *the forward solutions have a different rank for each location, which is
> not supported*
>
>
>
> The rank of the leadfdield is reduced at each sourcemodel position to the
> default 3. However, it sometimes has an even lower rank (often 0) at
> certain sourcemodel positions, and I am not sure how to interpret it. We
> use a cortical sheet based sourcemodel, and I have noticed that only a
> handful (<<1%) of positions are affected. My educated guess would be to
> exclude those positions, but I am not sure how it affects the analysis,
> either.
>
>
>
> Kind regards,
>
> Tibor
>
>
>
> *Auer, Tibor M.D. Ph.D.*
>
> *Research Fellow*
>
> *School of Psychology, Faculty of Health and Medical Sciences*
>
> University of Surrey, Guildford GU2 7XH
>
> T.Auer at surrey.ac.uk
>
> @TiborAuer
> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftwitter.com%2FTiborAuer&data=02%7C01%7Ct.auer%40surrey.ac.uk%7Cdb32da458c424eedef2908d7d4bd1421%7C6b902693107440aa9e21d89446a2ebb5%7C0%7C0%7C637211780868086968&sdata=zrT5%2FnGGsar14C3WartuU99tzsfLu30Peh9fuaqrAUg%3D&reserved=0>
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