  Epistemological consequences of quantum nonlocality (entanglement) are
discussed under the assumption of a universally valid Schr\"odinger equation in
the absence of hidden variables. This leads inevitably to a {\it many-minds
interpretation}. The recent foundation of quasi-classical neural states in the
brain (based on environmental decoherence) permits in principle a formal
description of the whole chain of measurement interactions, including the {\it
behavior} of conscious observers, without introducing any intermediate
classical concepts (for macroscopic "pointer states") or "observables" (for
microscopic particle positions and the like) --- thus consistently formalizing
Einstein's {\it ganzer langer Weg} from the observed to the observer in quantum
mechanical terms.
