Feature selection for cursor task

This forum deals with BCI2000 configuration issues.
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Ryan
Posts: 29
Joined: 27 Aug 2010, 15:03

Feature selection for cursor task

Post by Ryan » 18 Nov 2010, 17:32

Greeting, guys,

After the feature selection session, I got really bad results. the r-squared value in the high frequency band is really large. I know if there are big r squared value in low frequency band, it's due to the noise; but what is the reason for high frequency band to have large r-squared value?

and also, for the calibration feature selection part, following the cue,the subbject should imagine the movement or perform the real movement, or it doesnot matter?

I check the spectra plot on one channel, and found out the frequency for the biggest r-squared value is not consistent with the frequency that shows the biggest energy drop. I wonder if there is something I did wrong, or there is a proper reason for this phenomenon.

Thanks a lot!
Ran

jawilson
Posts: 109
Joined: 28 Feb 2005, 16:31

Post by jawilson » 13 Dec 2010, 10:00

Ryan (or Ran?)
It is hard to tell what is going wrong without seeing a plot. What is the "high frequency band?" Is this 100+ Hz? What is is large r^2 value? Also, are you doing a P300 or a Mu-rhythm experiment?

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