When we talk about abnormal behaviour,somebody will wonder, “How can anybody tell what is abnormal behaviour”? Abnormal, refers to any behavior that is not typical. In the practice of psychology it has further come to mean mental illness. The causes of abnormal behaviour are complex and they are always interconnection. The basic causes of abnormal behaviour can be considered three aspects: biological fault, childhood’s habitation, drug.
The first cause of abnormal behavior is biological fault.DNA acts as the very important role in the process of human’s fetation.chromosomal aberration will affact directly baby’s health,become a morbid people.A undound people le

Abnormality, in the sense of something deviating from the normal or differing from the typical (such as an aberration), is a subjectively defined behavioral characteristic, assigned to those with rare or dysfunctional conditions. Defining who is normal or abnormal is a contentious issue in abnormal psychology.

• Statistical Infrequency: In this definition of abnormality, behaviors which are seen as statistically rare, are said to be abnormal. For instance one may say that an individual who has an IQ below or above the average level of IQ in society, is abnormal. However this definition obviously has limitations, it fails to recognize the desirability of the particular behavior. Going back to the example, someone who has an IQ level above the normal average wouldn’t necessarily be seen as abnormal, rather on the contrary they would be highly regarded for their intelligence. This definition also implies that the presence of abnormal behavior in people should be rare or statistically unusual, which is not the case. Instead, any specific abnormal behavior may be unusual, but it is not unusual for people to exhibit some form of prolonged abnormal behavior at some point in their lives1.
• Deviation from Social Norms defines the departure or deviation of an individual, from society’s unwritten rules (norms). For example if one was to witness a man jumping around, nude, on the streets, the man would be perceived as abnormal, as he has broken society’s norms about wearing clothing, not to mention ones self dignity. There are also a number of criteria for one to examine before reaching a judgment as to whether someone has deviated from society’s norms. The first of these criterion being culture; what may be seen as normal in one culture, may be seen as abnormal in another. The second criterion being the situation & context one is placed in; for example going to the toilet is a normal human act, but going in the middle of a supermarket would be seen as highly abnormal. The third criterion is age; a child at the age of three could get away with taking off its clothing in public, but not a man at the age of twenty. The fourth criterion is gender. The fifth criterion is historical context; standards of normal behavior change in some societies, sometimes very rapidly.
• FF: The Failure to Function Adequately definition of abnormality defines whether or not a behavior is abnormal if it is counter-productive to the individual. The main problem with this definition however is that psychologists cannot agree on the boundaries that define what is ‘functioning’ and what is ‘adequately’, as some behaviors that can cause ‘failure to function’ are not seen as bad i.e. firemen risking their lives to save people in a blazing fire.
• DIM: Deviation from Ideal Mental health defines abnormality by determining if the behavior the individual is displaying is affecting their mental well-being. As with the Failure to Function definition, the boundaries that stipulate what ‘ideal mental health’ is are not properly defined, and the bigger problem with the definition is that all individuals will at some point in their life deviate from ideal mental health, but it does not mean they are abnormal; i.e., someone who has lost a relative will be distressed, but would not be defined as abnormal for showing that particular behavior. On the contrary, there are some indications that some people require assistance to grieve properly2
A common approach to defining abnormality is a Multi-Criteria approach, where all definitions of abnormality are used to determine whether an individuals behavior is abnormal. For example, if an individual is engaging in a particular behavior that is preventing them from ‘functioning’, breaks a social norm and is statistically infrequent, then psychologists would be prepared to define this individual’s behavior as abnormal. A good example of an abnormal behavior assessed by a multi-criteria approach is depression: it is commonly seen as a deviation from ideal mental stability, it often stops the individual from ‘functioning’ a normal life, and, although it is a relatively common mental disorder, it is still statistically infrequent; most people will not experience significant major depressive disorder in their lifetimePERSONALITY: FACT OR FICTION
There is a long debate in psychology over whether or not there is such a thing as “Personality”. There are lots of evidence Mischel, (1960); Ben and Allen, (1976) etc that people’s behaviours (including thought, feeling etc) are influenced by the situations they find themselves in and not some underlying set of personality traits. Yet, you may say of course personality is real – I know I have a personality! I have certain characteristics that are more or less consistent overtime. I have heard many people say: “I know the type of person I am”, but we may be mistaken. Researches on people’s memory processes have shown biases people make when they recall information about themselves. One of such is the tendency to see consistency and order even when they are absent. We simply believe in personality and so we “remember’” being consistent in our lives. Acting the same way, feeling the same thing, thinking the same thought regardless of the situation we find ourselves.
But our memories are merely “reconstructions” and if this is so, then there may be no such thing as personality. If personality is actually fiction, how do we talk of personality disorders?


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