Does folding hand discourage prayer?

It has been said that out body posture can affect on our emotional and psychological state.  

When I was a child I was taught "how to pray" by folding my hands and bowing my head. 

In every other situation when I put my head down and my hands together I generally am signaling to others a sort of disengagement, disapproval, or even anger.  

I wonder if teaching children to pray by folding your hands and bowing your head results affecting the child's attitude toward prayer? 

Perhaps this is why the palms up is more ancient prayer posture in religious traditions.