Does anyone notice that a lot of golfers practice swings often look nothing like their ball-hitting swing? Their practice swing has a nice tempo, looks fluid....effortless, good shoulder turn, etc. Then during the "real" swing they look tense, they shorten their shoulder turn, the club travels on a different path, and some folks stand up halfway down, etc. None of which they did during their practice swing.
There's something about the ball being in front of a club that subliminally creates an apprehensive, untrusting mindset. My old golf coach would tell us to NOT do a practice swing and instead think of the "real" swing as being the practice swing. It's very interesting how the brain can switch gears so darn quickly and ruin an otherwise decent swing.
The tapes which run "full time" in our heads which are negative in content is based on experiences of bad shots. And, obsessive compulsive behavior of some, to hit perfect shots. A fallacy and personality flaw mixed with an imperfect game. The reason many quit the game. Disciplining the mind to hear Voice #2 is the goal and the challenge of every shot, every game. Building positive experiences and "dwelling" on THAT content.