What are quantum theorists doing at a conference on consciousness?

The reason why orthodox quantum theory necessarily invokes consciousness is explained. Several procedures whereby the Born probability rule can be introduced are discussed, and reasons are given for prefering one in which consciousness selects a unique realised world. Consciousness is something outside of the laws of physics (quantum mechanics), but it has a real effect upon the experienced world. Finally, orthodox quantum theory is shown to require that consciousness acts non-locally.