Subjective games in a non-cooperative game

There are many examples of non-cooperative games in which a player does not necessarily select the Nash equilibrium strategy in practice. In order to understand such a situation rationally, we propose a subjective game for each player which is constituted by taking his motive for selecting his strategy into consideration. In particular we give a rational model for explaining an actual behavior of each player in the prisonerʹs dilemma game.