The problem of altered states of consciousness psychological analysis
is discussed. Phenomenology of altered states of consciousness and lit
erary review of the matter are presented. The criteria of such states
are presented: altered form of categorisation; subject's estrangement
from one's own psychic products; the changes of inner experience emoti
onal coloring; breach of consequence in inner reality events; changes
in time perception. The authors' own methods of altered states of cons
ciousness rehabilitation are described.