References

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spine
Posts: 13
Joined: 02 Mar 2020, 22:07

References

Post by spine » 22 Mar 2020, 19:03

Hello,

Out of curiosity, does BCI2000 provide the ability for a user to implement an infinity reference (Known as REST in the literature) in a source module? I know CAR and laplacian filters are used, but this was one reference I was wondering about. Would a user have to code up their own source module if they would like to use this type of reference?

Thank you,

Mohammad

mellinger
Posts: 1114
Joined: 12 Feb 2003, 11:06

Re: References

Post by mellinger » 25 Mar 2020, 11:12

Hi,

the REST method is based on a head model and an associated lead field matrix. Lead field matrices differ depending on the reference that is used. In order to transform the signal from one reference to the other, first multiply with the pseudoinverse of the actual lead field, and then multiply with the lead field of the desired reference, e.g. infinity reference. Combining the pseudoinverse of the actual lead field and the desired one into a single matrix, you have a spatial filter that you may enter into BCI2000's spatial filter matrix parameter.

HTH,
Juergen

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