[FieldTrip] sloreta doest not get unity source variance

[Schoffelen, J.M. (Jan Mathijs)]

Hi Yiyao,

To be honest, I don’t understand your question. And it is not clear what the problem is.

Can you please have a look at the documentation below and reformulate your question, so that the readership of the list can constructively think along?

https://www.fieldtriptoolbox.org/faq/how_to_ask_good_questions_to_the_community/

https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1002202

http://www.catb.org/esr/faqs/smart-questions.html

Best wishes,
Jan-Mathijs



On 5 Oct 2022, at 18:49, Yiyao Ye Lin via fieldtrip <fieldtrip at science.ru.nl<mailto:fieldtrip at science.ru.nl>> wrote:


Dear researchers,

After reading the sLoreta theory, I attempted to understand the sloreta implementation detail. I attempted to obtain the source covariance matrix, and I could not get the expected unit variance. To do this, I attempted to calculate by two ways:
a)       lf'*invG*lf after line 268 of ft_inverse_sloreta
b)      lf(:,ii)'*invG*lf(:,ii) at line 267 of ft_inverse_sloreta
For this, I used EEG signal with average reference.
What's wrong? How can the unity variance of source variance matrix?

Best regards
*******************
Yiyao Ye Lin
C/Camino de Vera SN
Universidad Politècnica de València
Departamento de Ingeniería Electrónica, Ed. 7F
46022, València
València
Ext. 76026

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