Intrapersonal communication refers to the communication that takes place within, with, and to the self; thus it is a necessary form of communication because it helps define who we are as individuals.  We are aware that there are two selves for every one human being (the public/outer self and the private/inner self).  Such is proven with a mirror: the person looking in the mirror represents the person reflected back, thus illustrating that the real self recognizes and perceives a self within the self.  Non-humans are conscious of basic sensations, yet they lack self-consciousness that emphaszies their awareness of their own selves in terms of cognition, perception, memory, desires, motivation, personality, and conscience (Beck et al., 2005).  Self-concept is involved in this idea as it is defined as the image you have of yourself.  It is determined by many factors, including the perceptions others have of you, the comparisons you make between yourself and others, the teachings of your culture and envronment, and your interpretations of your behaviors.  In order to have self-concept, though, self-awarness is needed to understand the layers of you as an individual.  The Johari window emphasizes this concept as it divides the self into four areas: open self (the information about you that is knonw to yourself and others); blind self (information about yourself that you do not know but others do); unknown self (information about yourself that both you and others do not know); and hidden self (information about yourself that you know and others do not).  Thus, in order to be an effective communicator, it is necessary to understand your two 'selves' in relation to others (DeVito, 2005).