 A curious feature of this theory is that in order to get the observer’s mental state in some way to supervene on his physical state, Albert and Loewer associate with each observer a continuous infinity of minds. The observer’s physical state, like all other physical systems, always evolves in the usual deterministic way, but each mind jumps randomly to a mental state corresponding to one of the Everett branches that is produced in each measurement-like interaction. The probability that a particular mind will experience an Everett branch associated with a quantum-mechanical amplitude \(q\) is equal to \(q\) squared. On the mental dynamics, then, one should expect \(a\)-squared proportion of \(J\)’s minds to end up associated with the result “spin up” (the first term of the expression above) and \(b\)-squared proportion of \(J\)’s minds to end up associated with the result “spin down” (the second term of the expression above). The mental dynamics is also memory-preserving so that once a mind is associated with a particular branch, the mental state of the mind remains compatible with the measurement records represented in that branch.