Include Laplacian in Offline Analysis

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ngiri
Posts: 5
Joined: 02 Jul 2021, 09:54

Include Laplacian in Offline Analysis

Post by ngiri » 08 Feb 2022, 06:08

Dear forum,

I am working on a SMR-training protocol using EEG and BCI2000, similar to the one described here https://www.bci2000.org/mediawiki/index ... I_Tutorial. After the screening session, I use the Offline Analysis tool to determine the target frequency. Unlike the real-time analysis, the Offline Analysis tool does not include a spatial filter. I would like to change this. For the spatial filter in the real-time analysis, I implemented a Large Laplacian filter, and I think it would be more accurate to include the Large Laplacian filter in the Offline Analysis as well. My question is: how can I do this? How can I add the Large Laplacian into the Offline Analysis tool? Can this be done in one of the Matlab scripts of the Offline Analysis directory, and if yes, where exactly?

I appreciate any help!

Natasha

mellinger
Posts: 1188
Joined: 12 Feb 2003, 11:06

Re: Include Laplacian in Offline Analysis

Post by mellinger » 15 Feb 2022, 13:20

Hi,

the OfflineAnalysis tool actually includes a spatial filter, the optional Common Average Filter (CAR Filter).
This is implemented in the carFilt.m file.
In a first step, you may replace the call to carFilt() with a call to your own Laplacian filter function, and modify the GUI label to reflect this.
In a further step, you can modify the GUI to have both the CAR filter and the Laplacian filter als a choice.

Let me know if you need further assistance,
Juergen

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