  Extreme-order statistics is applied to the branches of an observer in a
many-worlds framework. A unitary evolution operator for a step of time is
constructed, generating pseudostochastic behaviour with a power-law
distribution when applied repeatedly to a particular initial state. The
operator models the generation of records, their dating, the splitting of the
wavefunction at quantum events, and the recalling of records by the observer.
Due to the huge ensemble near an observer's end, the branch with the largest
number of records recalled contains almost all "conscious dimension".
