How much of batting is mental?
We certainly know that you ignore what's happening in your head as you bat you will fail more often. Yet, so often the advice is to bat with a clear mind and "trust your technique".
It's certainly true that technical methods rarely change between formats and situations, but if you bat with the same tactics in the last 5 of a Twenty20 as you do opening in the first innings of a 4 day game you are bound for failure.
Similarly, if you spend the time between balls frantically worrying about how the bowler has spotted your weakness outside off stump and poor footwork, you end up playing worse and getting out.
The famous paralysis by analysis.
Of course, there is another batting method, a method that leads to far more success.