  The possibility of quantum interference of a composite object with many
internal degrees of freedom is studied, such that the internal degrees play a
role of an internal environment. In particular, if the internal degrees have a
capacity for an irreversible record of which-path information, then the
internal-environment induced decoherence prevents external experimentalists
from observing interference. Interference can be observed only if the
interfering object is sufficiently isolated from the external environment, so
that the object cannot record which-path information. Extrapolation to a
hypothetical interference experiment with a conscious object implies that being
a Schrodinger cat would be like being an ordinary cat living in a box without
any information about the world external to the box.
