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Irrationality is cognition, thinking, talking or acting without inclusion of rationality. It is more specifically described as an action or opinion given through inadequate use of reason, emotional distress, or cognitive deficiency. The term is used, usually pejoratively, to describe thinking and actions that are, or appear to be, less useful, or more illogical than other more rational alternatives. 
Irrational behaviors of individuals include taking offense or becoming angry about a situation that has not yet occurred, expressing emotions exaggeratedly (such as crying hysterically), maintaining unrealistic expectations, engaging in irresponsible conduct such as problem intoxication, disorganization, or extravagance, and falling victim to confidence tricks. People with a mental illness like schizophrenia may exhibit irrational paranoia.
These more contemporary "normative conceptions" of what constitutes a manifestation of irrationality are difficult to demonstrate empirically because it is not clear by whose standards we are to judge the behavior rational or irrational.
Explanation of occurrence 
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The study of irrational behavior is of interest in fields such as psychology, cognitive science, economics, game theory, and evolutionary psychology, as well as of practical interest to the practitioners of advertising and propaganda.
Theories of irrational behavior include:
- people's actual interests differ from what they believe to be their interests.
- mechanisms that have evolved to give optimal behavior in normal conditions lead to irrational behavior in abnormal conditions.
- situations outside one's ordinary circumstances, where one may experience intense levels of fear, or may regress to a fight-or-flight mentality.
- people fail to realize the irrationality of their actions and believe they are acting perfectly rational, possibly due to flaws in their reasoning.
- apparently irrational decisions that are actually optimal, but made unconsciously on the basis of "hidden" interests that are not known to the conscious mind.
- an inability to comprehend the social consequences of one's own actions, possibly due in part to a lack of empathy.
- Some people find themselves in this condition by living "double" lives. They try to put on one "mask" for one group of people and another for a different group of people. Many will become confused as to which they really are or which they wish to become.
Factors which affect rational behavior include:
- stress, which in turn may be emotional or physical
- the introduction of a new or unique situation
- peers who convey irrational thoughts as necessary idiosyncrasy for social acceptance
Intentional irrationality 
Irrationality is not always viewed as a negative. Dada Surrealist art movements embraced irrationality as a means to "reject reason and logic". André Breton, for example, argued for a rejection of pure logic and reason which are seen as responsible for many contemporary social problems.
In science fiction literature, the progress of pure rationality is viewed as a quality which may lead civilization ultimately toward a scientific future dependent on technology. Irrationality in this case, is a positive factor which helps to balance excessive reason.
In psychology, excessive rationality without creativity may be viewed as a form of self-control and protection. Certain problems, such as death and loss, may have no rational solution when they are being experienced. We may seek logical explanations for such events, when in fact the proper emotional response is grief. Irrationality is thus a means of freeing the mind toward purely imaginative solutions, to break out of historic patterns of dependence into new patterns that allow one to move on.
Irrationalist is a wide term. It may be applied to mean "one without rationality", for their beliefs or ideas. Or, more precisely, it may mean someone who rejects some aspect of rationalism, variously defined. For example religious faith may be seen as, in part, a rejection of complete rationalism about the world; this would be contested by some religious thinkers, in that the rational is a debatable term. Additionally, some think it irrational for someone to believe that order and complexity can arise by chance. On the other hand, it might be considered irrationalist to buy a lottery ticket, on the basis that the expected value is negative.
In contemporary philosophy "irrationalism" is, inspired by Hindu and Buddhist philosophies, emerging into a new growing school of thought in which the importance of our intuitive capability is stressed.
In literature 
Much subject matter in literature can be seen as an expression of human longing for the irrational. In Romanticism irrationality was valued over the sterile, calculating and emotionless philosophy brought about by the Age of Enlightenment and the Industrial Revolution. The Dadaists and Surrealists later used irrationality as a basis for their art. The disregard of reason and preference for dream states in Surrealism was an exaltation of the irrational and the rejection of logic.
Mythology nearly always incorporates elements of fantasy and the supernatural; however myths are largely accepted by the societies that create them, and only come to be seen as irrational through the spyglass of time and by other cultures. But though mythology serves as a way to rationalize the universe in symbolic and often anthropomorphic ways, a pre-rational and irrational way of thinking can be seen as tacitly valued in mythology's supremacy of the imagination, where rationality as a philosophical method has not been developed.
On the other side the irrational is often depicted from a rational point of view in all types of literature, provoking amusement, contempt, disgust, hatred, awe, and many other reactions.
In psychotherapy 
The term irrational is often used in psychotherapy and the concept of irrationality is especially known in rational emotive behavior therapy originated and developed by American psychologist Albert Ellis. In this approach, the term irrational is used in a slightly different way than in general. Here irrationality is defined as the tendency and leaning that humans have to act, emote and think in ways that are inflexible, unrealistic, absolutist and most importantly self- and social-defeating and destructive.
See also 
- Amygdala hijack
- Behavioral economics
- Bounded rationality
- Cognitive Bias
- Irrationalism and Aestheticism
- Logical Fallacy
- Optimism bias
- Rationality and power
- Self-serving bias
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- Kreis, Steven (2009-08-04). "Lecture 16: The Romantic Era". Historyguide.org. Retrieved 2012-12-08.
- Ellis, Albert (2001). Overcoming Destructive Beliefs, Feelings, and Behaviors: New Directions for Rational Emotive Behavior Therapy. Promotheus Books.
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (September 2010)|
- Stuart Sutherland Irrationality: Why We Don't Think Straight, 1992, reissued 2007 by Pinter & Martin ISBN 978-1-905177-07-3
- Robin Vermoesen "Rationaliteit is Vals", 2007, www.unibook.com
|Look up irrationality in Wiktionary, the free dictionary.|
- Craig R. M. McKenzie. Rational models as theories – not standards – of behavior. TRENDS in Cognitive Sciences Vol.7 No.9 September 2003
- REBT-CBT NET- Internet Guide to Rational Emotive Behavior Therapy