For my final Physical Computing project I am currently constructing an EEG machine based on the design of the OpenEEG project at sourceforge. The idea is to use signals that are known to cause predictable spikes to trigger some action, what exactly that is still needs to be determined.
For a general overview of EEGs consider the Wikipedia entries, they give a (rather enthusiastic) overview of the device.
1. EEG – Overview
So far I've ordered the openEEG boards from Olimex and made active electrodes. However, it seems as if one channel (2 electrodes) isn't working properly, which may due to the whole soldering and desoldering they went through. A great guide on how to build your own active electrodes can be found here:http://www.dcc.uchile.cl/~peortega/ae/
Here is a flic of the whole project at work, so far
In the long run, I think I would like to go for something ambitious. Next semester I will be taking Learning bit by bit and will hopefully learn about writing classification algorithms (regressive ones in particular because they facilitate one-dimensional classification) using varies EEG potentials (slow sensory motor cortex activity, P300 response, N400 & P600 respectively).
However, more work is still to come and to be done.