Lance Allen wrote: ....... >We have lovely colour 3D EEG images of Brain Activity super-imposed on >a human head image running in our High Density EEG Lab. >Calibrating the phase delay from electrode to electrode was a bitch.. >took me 4 months designing an in house system ( I really hate >gleaning microvolt signals). Lance, Sounds like you are the guy Russell McMahon wants to talk to. Plus, you are both in NZ, AFAICT. Same city? Same university? Wouldn't that be a stitch. BTW, regarding phase, don't most commercial EEG machines have pretty equivalent phase shifts between the many channels? BAck when I did this, I don;t recall us having any particular problems along those lines. ?????? cheers, - Dan Michaels ==============