Researchers in sports psychology have known about this for awhile, but in a clutch situation, over-thinking can disrupt performance. This is demonstrated very well by a great video report from the BBC
. Anytime we get anxious we start to micro-analyze our performance, and this will negative impact performance due to increased and unpracticed communication between brain structures. The lesson is to try and be as natural as possible in performance situations and let the activity flow rather than over-think.