  Conceptual problems in quantum mechanics result from the specific quantum
concept of reality and require, for their solution, including the observer's
consciousness into quantum theory of measurements. Most naturally this is
achieved in the framework of Everett's "many-worlds interpretation" of quantum
mechanics. According to this interpretation, various classical alternatives are
perceived by consciousness separately from each other. In the Extended Everett
Concept (EEC) proposed by the present author, the separation of the
alternatives is identified with the phenomenon of consciousness. This explains
classical character of the alternatives and unusual manifestations of
consciousness arising "at the edge of consciousness" (i.e. in sleep or trance)
when its access to "other alternative classical realities" (other Everett's
worlds) becomes feasible. Because of reversibility of quantum evolution in EEC,
all time moments in the quantum world are equivalent while the impression of
flow of time appears only in consciousness. If it is assumed that consciousness
may influence onto probabilities of alternatives (which is consistent in case
of infinitely many Everett's worlds), EEC explains free will, "probabilistic
miracles" (observing low-probability events) and decreasing entropy in the
sphere of life.
