Rationalization (psychology)
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In psychology and logic, rationalization is the process of constructing a logical justification for a belief, decision, action or lack thereof that was originally arrived at through a different mental process. It is a defense mechanism in which unacceptable behaviors or feelings are explained in a rational or logical manner; this avoids the true explanation of the behavior or feeling in question.[1][2]
This process can be in a range from fully conscious (e.g. to present an external defense against ridicule from others) to mostly subconscious (e.g. to create a block against internal feelings of guilt).
Rationalization is one of the defense mechanisms proposed by Sigmund Freud, which were later developed further by his daughter Anna Freud.
[edit] Examples
For example, consider a person who bought one of the first home computers in 1980 primarily motivated by the excitement of playing with a computer. If he felt that his friends would not accept "having fun" as a sufficient reason for the purchase, he might have searched for other justifications and ended up telling them how much time it was going to save him in doing his taxes.