Status EEG problems/techniques?

Hey all,

I have heard about EEG throughout my life and I find it to be extremely
interesting and have a wide range of implications if the technology
advances further, but I realize that I have no knowledge as to the details
of problems and hurdles people are facing in the field. I was hoping that
someone on this list would have enough knowledge about this field to answer
some of my questions or at least send me in the right direction.

For one, I know that both the hardware and software have their own issues.
Various different types of electrodes exist as well as different methods of
amplifying the signals in preparation for processing. I'm not as interested
in the hardware as I am in the 'software', or more accurately the methods
used to transform these voltages from signal domain into other spaces (such
as inferring complex 'actions' or decoding sight).

What I am really wondering is how far have we come in this respect? Of
course there are well known products such as Emotiv, but I am more
interested in tackling the problem and coming up with a better solution
than just buying some premade device. An in order to do so, I feel like I
need some background knowledge and need to know where we stand today. I was
hoping you guys could help me out with that!

Just as a start, are there any papers in temporal correlation of different
regions of the brain with respect to intention to action? The closest thing
I have found to that is 'Detection of self-paced reaching movement
intention from EEG signals' by Eileen Lew et all. (
http://infoscience.epfl.ch/record/178379/files/LewChSiMi12.pdf) But sadly,
they did not tackle the particular thing I am interested in.

Best Regards,
Jay

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