The ‘Power of Expectation’ is invoked in this experiment from Prometheus Rising by Robert Anton Wilson. It is also Professor Richard Wiseman’s 3rd principle of becoming luckier (from his 10 year study of luck).
The Experiment from Prometheus Rising:
“The experiment is to vividly visualise a quarter, imagine vividly that you will find that quarter in the street.
You look for that quarter in the street every time you are out, while still continuing to visualize it, and see how long it takes you to find it.
Next, explain the experiment using “selective attention” hypothesis - that is, of the bounty of lost quarters everywhere in the street, you were bound to find one sooner or later.
Then explain the experiment using the “mystical” hypothesis. In other words, you believe that you made the quarter manifest into this universe.
Now go looking for a second quarter.
Compare the time it takes to find it using the “selective attention” hypothesis with the time it takes you to find it using the “mystical” hypothesis.
This experiment is designed to help the reader understand the role of thought and belief in structuring the universe.
Whatever it is that you think, your mind will immediately set about proving - the existence of God, the sovereignty of the American President, or any number of conspiracy theories. Your mind will find proofs of those things everywhere.”