Read this excerpt from "The Big Shot."
In her most recent test, she asked golfers who had just finished playing to find on a chart a black circle that was the same size as a cup on the green. She says, "What we found was that the golfers who scored better selected larger circles," adding that this suggests "that they perceive the hole as bigger." Golfers who didn't score as well chose smaller circles.
What is the effect of visualizing the "hole as bigger"?
