Re: [Openeeg-list] Re: Do band pass filters only permit waves through?

[Jim P. <ji...@ua...>]

John C Atkeson wrote:
>   Thanks for the links on principle component analysis, I will now 
> devote some effort trying to understand what it is. ;-)

Well, to give you a start, the way it was sold to me was as a black
box into which you put a large number of recordings (of brainwaves
mixed with evoked potentials in this case), and out of the other side
comes a list of wave-shapes which are statistically the most
significant ones that the recordings can be broken down into.  So, in
theory, it would likely pull out the evoked potential shape as one of
these components.

Also, I think it was claimed that you could use the matrixes built up
from the analysis to detect one of these components at the moment it
occurs.  (Maybe this is as simple as convolving the evoked potential
shape with the incoming signal; I never did get 100% understanding of
this.)

I hope I am not side-tracking you with all this PCA stuff, though.

Jim

P.S.  If you are completely stuck for EEG recordings, you could look
at the example ones on the BWView page on my site (provided by Jim
Meissner; there are more on his site).  There is occasional sync loss
to watch out for in these files.

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