"Shunting" through linked ears is a possibility... an image distortion due to impedance imbalance between the ears (see the paper by Rosenfeld in the JNT about this). You might try remontaging to a Laplacian montage and see if the areas of voltage suppression remain. The linked ears are a poor method of seeing local function (Ian Cook, et al., 1998, UCLA NPI Lab). > The artefact behind this effect, is electrical activity picked up at > the right earlobe? > And if so, could the culprit be: > 10-20 paste on the outside of the A2 electrode, > residual nu-prep > earring (or nu prep in the pierced lobe) > > What other sources could generate this artefact?