Placebo
The placebo effect points to the notion that what we think really matters. If the doctor gives us a pill and says it will make us better and we believe his authority, then we will likely feel better. Even if it's a sugar pill.
The “no”cebo effect is the opposite. Oftentimes we focus on the negative and it produces a negative outcome. Most golfers know what happens when they focus on the tree they want to miss.
Pay attention to what you DO want.
Pro Tip: Our brain doesn’t process the “don’t” in “don’t hit that tree.”