Interesting topic...
For me there are 2 types, the one that speaks and the one that feels.
The one that speaks is the one that convinces me that I know my music, and myself, and that I am the best pianist in the world, right before I go on stage. Its the voice I argue with. And belive me, it always wins... it certainly doesnt take any of my sh!t.
The one that feels is the power that takes over when I walk on stage, and when I play. It does not talk, it just guides. It sets my mind, and heart and soul in focus and puts the performance in motion. It shuts out any distractions and irritation and hones in on the music alone.
There certainly must not be any interaction whatsoever between the first "voice confidence" (my mind) and the 2nd "emotional confidence" once the performance has begun (Once I have walked on stage) as the performance is beyond its control, but it ultimately tries to take over, filling in the silence with unneccesary chatter and thus, nervousness, panic, mental chaos, and almost an entire system shutdown... which results in sitting down at the piano and not knowing what note the stupid piece thats been practised for 6 months non-stop, starts on. Thus, a failed performance.
But by letting the emotional take over, there is no distraction, there is no nerves, only music. The only importance. Not the audience, not the judges, not even the performer, just the music.
I hope this has answered your question? As I have just rambled on incoherently.. maybe what I am saying makes sense... maybe not... oh well.
All the best,
CN