I find that while i'm hitting, if I think about more than one thing, I'm toast. So, if I'm telling myself "keep your head down on the ball", or "hit the ball early", I'm fine.
If I'm thinking both things at once, errors come in droves.
Where I'm hitting the ball to is a complete different side of the brain..that part doesn't interfere with strokes, unless in trying to direct the ball it makes you start pushing and not completing your stroke.
I'm sure everyone is different to some degree in this regard.
3.5 player. Equipment: Prince NXG OS, hybrid kevlar mains/poly crosses 50 lbs