Expectations directly determine how we experience the world.
Expectation activates the brain in the same ways as the real thing (similar to visualizations 0G3H1). Expectation of reward (surprises even more so) release dopamine. Important to avoid bad expectations because they cause dopamine crash 0G3M1. People perform better when happy 0G3M2. People may be inclined to offer unrealistic expectations which should be avoided 0G2B2B3.