  We investigate a new form of contribution for the anomalous magnetic moment
of all particles. This common origin is displayed in the framework of a recent
treatment of electrodynamics that is based in the introduction of an
electromagnetic metric which has no gravitational character. This effective
metric constitutes a universal pure electromagnetic process perceived by all
bodies, charged or not charged. As a consequence it yields a complementary
explanation for the existence of anomalous magnetic moment for charged
particles and even for non-charged particles like neutrino.
