In simple words, practice is visible and implementable. On the other hand, perception is something emotional and cannot be seen. These two forces might be off opposing nature but they are somehow interrelated to each other.
Our perception are made from our experiences and experiences happens from practice of actions and these perception affect our potential actions.
To enhance our cognitive capacity the best way is to travel and meet different people, communicate with them and know their options and problems.
The Emancipation Proclamation only freed the slaves that were in rebelling states. It didn't free the slaves in the North or effect the border states at all.
