Silencing the Critical Mind in Performance

In the video "A Master Class in Jazz Performance and Creativity with Pianist Kenny Werner" found at http://www.youtube.com/watch?v=Un3p614XExc Kenny speaks of why it's important to silence the critical mind in performance. At 2:50 he states, "The zone is created by not criticizing yourself in performance. You cannot afford to criticize yourself in performance... that breaks the zone... that breaks the groove. But of course you may hear notes you don't like, but don't key in on that." Thanks to fellow student Annemarie for sharing this.