The Doctrine of Microphysical Supervenience states that microphysical duplicates cannot differ in their intrinsic properties. According to Merricks (Mind 107(425):59–71, 1998a, Objects and persons, Oxford University Press, 2001), however, this thesis is false, since can with respect the property consciousness. In my view, Merricks’ argument plausible, extant attempts reject it are problematic. ...