“Horses don’t just relax when they have learned something, they also learn faster when they are in parasympathetic state. So as a horse trainer it is important to make sure your horse is as relaxed as possible when trying to teach him something new. This should also discourage the use of force when training horses, as forceful methods are likely to cause stress and so inhibit the learning process rather than promote it.”
Read More Here: http://avivas-thoughts.blogspot.com/2014/08/licking-and-chewing-what-does-it-really.html?m=1