CHAPTER 17 The Nature and Causes of Mental Disorders
CLASSIFICATION AND DIAGNOSIS OF MENTAL DISORDERS
To understand, diagnose, and treat psychological disorders, some sort of classification system is needed.
The need for a comprehensive classification system of psychological disorders was first recognized by
What is Abnormal?
The term abnormal literally refers to any departure from the norm (e.g. a really tall or really
short people, or really smart people like me are considered abnormal). However, the distinction
between normal and abnormal behaviour can be very subjective. Psychologists stress that the
most important feature of mental disorder is not whether behaviour is abnormal but rather if
its maladaptive. Mental disorders cause distress or discomfort and interfere with peoples
ability to lead satisfying, productive lives.
Although the diagnosis of mental disorders should be as objective as possible, it may never be
completely free from social and political judgments (i.e. what is thought of as retarded in one
culture may be sacred in another). It is important to note that mental disorders bring pain and
discomfort to these people and to their friends and families.
Perspectives on the Causes of Mental Disorders
There isnt a single cause of mental disorders but in general, they are cause by the interaction of
hereditary, cognitive and environmental factors. Sometimes, genetics can play a strong role and
the person carrying those genes is likely to develop a mental disorder. To understand mental
disorders, a complete study must be taken deriving all possible factors. There are many
psychology related profession who try to understand mental disorders and each vary their
emphasis on the three given factors. The perspectives differ primarily in their explanation of the
etiology (origin) of mental disorders.
o The Psychodynamic Perspective
This is based on Freuds early work: mental disorders originate in the intrapsychic
conflict produced by the three components of the mindid, ego and superego. For
some people the conflicts become so sever the minds defence mechanisms fail and
begin to distort reality or the individual may revert to an earlier stage of life (e.g. begin
acting like a kid). Mental disorders may involve extreme anxiety, obsessive thoughts and
compulsive behaviour, depression, and etc.
o The Medical Perspective
The origins of the medical perspective like in the work of the ancient Greek physician
Hippocrates. The medical model is based on the ideas that mental disorders are caused
by specific abnormalities of the brain and nervous system and that they should be
approached for treatment in the same way as physical illnesses. However, not all mental
disorders can be traced so directly.
o The Cognitive-Behavioural Perspective
The cognitive-behavioural perspective holds that mental disorders are learned
maladaptive behaviour patterns that can be best understood by focusing on
environmental factors and a persons perception of those factors. A mental disorder is
not something that arises spontaneously within a person but caused by the persons
interaction with his or her environment.o The Humanistic Perspective
Mental disorders arise when people perceive that they must earn the positive regard of
others. They become overly sensitive to the demands and criticisms of others and come
to define their personal value primarily in terms of others reaction to them. They lack
confidence in their abilities and fell as though they have no stable, internal value as
persons. They may come to feel that they have no control over the control over the
outcomes of the important events in their lives. The goal of humanistic therapy is to
persuade people that they do have intrinsic value to help them achieve their own
unique, positive potential as human beings.
o The Sociocultural Perspective
Psychologists are paying more attention to the role of sociocultural factors in their
attempts to understand how people thinking and behave and the development of
disorders is the same. Proper treatment requires an understanding of cultural issues
which influence the nature and extent to which people interpret their own behaviours
as normal or abnormal.
o The Diathesis-Stress Model of Mental Disorders
Elements of the previous perspective are often combined to form a different, more
comprehensive, perspective on mental disorders. The diathesis-stress model says a
casual account of mental disorders based on the idea that mental disorders develop
when a person possesses a predisposition for a disorder and faces stressors that exceed
his or her abilities to cope with them.
The DSM-IV Classification Scheme
A system most commonly used in N. America for classifying mental disorders today is the