[PetitPrince]

> You can do it with surface EEG. sticking it inside your head - closer to centres where you can measure intentional and thought makes vy signal cleaner and more reliable.

Further clarification: when doing conventional EEG, the signal quality is so fragile that even blinking can produce recording artifact.

Also, there's the whole "put a shower cap with conductive gel" things that makes it very impractical for every day use.

[ramblenode]

You don't need a full EEG to do what the parent mentions. 3 electrodes around each eye (EOG) + ground is all that is needed. Even cheap commercial electrodes will work for this. Blinks can be filtered online with PCA-like techniques.

[dmicah]

There are 'dry' EEG electrodes which don't require conductive gel, and algorithms to remove the electrical effect of eye-blinks (ICA, etc.)