Klaus Balkenhol,
Trainer of the German Dressage Team and former Olympic champiuon. "Did you know that because the tongue is so extremely sensitive, it multiplies perceptions in this area dramatically?"
How have we been able to stimulate the sense of touch to obtain the desired effect?
As the palate is narrower than originally assumed the lozenge in the centre was shortened (this results in no pressure being put on the palate).
The angle of the link was twisted by 45 degrees. This ensures that when contact is taken up via the reins, the rounded link rests fully on the tongue without squeezing it.
In short, the sense of touch in the tongue is utilised and not abused, enabling clear instructions to be given through the reins.