(Re)action

Human action is the reaction of predefined relation.

Brain works in reaction of the action made by someone else.




For Example : If "A" and "B" are two persons encounter with one an other.
"A" acts something in the reaction of his/her relation with "B", while "B" showing reaction to respond A's reactionary, action. 

So, whenever two or more then two humans had encounter everybody shown reaction nun of them doing action.





If there is No Relation there will be no reaction causes by an action.