Abnormal behavior: Myths, realities, and controversies
The medical model applied to abnormal behavior
Medical model: proposes that it is useful to
think of abnormal behavior as a disease
Basis for many of the terms used to refer to abnormal
behavior (e.g., mental illness, psychological disorder)
Rise of medical model (in 18th, 19th centuries) brought
improvements in treatment
Problems with model
Thomas Szasz suggests that abnormal behavior usually
involves a deviation from social norms rather than an illness
Results in derogatory labels being applied to people
with disorders
Putting the model in perspective
Model is useful as an analogy
Diagnosis involves distinguishing one illness
from another
Etiology refers to the apparent causation and
developmental history of an illness
Prognosis is a forecast about the probable
course of an illness
Criteria of abnormal behavior
Three criteria most frequently used
Deviance (e.g., transvestic fetishism: a
sexual disorder in which a man achieves sexual arousal by dressing in
women's clothing)
Maladaptive behavior
Personal distress
The cultural bounds of normality
Considerable continuity across cultures in regard to
what is considered abnormal
But judgments of abnormality influenced to some extent
by cultural norms, values vCultural norms within a society can change
over time (e.g., homosexuality once considered a sexual disorder)
Key point is that diagnoses of psychological disorders
involve value judgments
Normality and abnormality as a continuum
Normality/abnormality matter of degree, not an either-or
proposition
David Rosenhan's classic study of "pseudopatients" in
mental hospitals
Psychodiagnosis: The classification of disorders
First version of Diagnostic and Statistical Manual of
Mental Disorders (DSM) published in 1952 by American Psychiatric
Association
Current version, DSM-IV introduced in 1994
The multiaxial system
Axis I -- clinical syndromes
Axis II -- personality disorders
Axis III -- general medical conditions
Axis IV -- psychological and environmental problems
Axis V -- global assessment of functioning
Controversies surrounding the DSM
Validity of diagnostic categories
Inclusion of everyday problems not traditionally thought
of as mental illnesses (e.g., extreme clumsiness in children)
The prevalence of psychological disorders
Epidemiology: study of the distribution of
mental or physical disorders in a population
Prevalence: the percentage of a population that
exhibits a disorder during a specified time period
Estimates suggest that psychological disorders are more
common than most people realize
Recent studies suggest that one-third of population may
be affected
Increase in numbers mostly due to more effective
tabulation of drug-related disorders
Most common disorders include anxiety disorders,
substance use disorders, and mood disorders
Anxiety disorders
Anxiety disorders: a class of disorders marked by
feelings of excessive apprehension and anxiety
Four principal types, not mutually exclusive
Quite common, occurring in about 17% of population
Generalized anxiety disorder (marked by a chronic,
high level of anxiety that is not tied to any specific threat)
Sometimes called "free-floating anxiety"
Frequently accompanied by physical symptoms (e.g.,
trembling, muscle tension, etc.)
Phobic disorder (marked by a persistent and
irrational fear of an object or situation that presents no realistic
danger)
Fears seriously interfere with everyday behavior
Common phobias include acrophobia (fear of heights),
claustrophobia (fear of enclosed places), hydrophobia (fear of water)
Panic disorder and agoraphobia
Panic disorder: characterized by recurrent
attacks of overwhelming anxiety that usually occur suddenly and
unexpectedly
Agoraphobia: a fear of going out to public
places
A common complication of panic disorders
More similar to panic disorder than phobic disorder
Vast majority of people with these disorders are women
Obsessive-compulsive disorder (OCD) is marked by
persistent, uncontrollable intrusions of unwanted thoughts (obsessions) and
urges to engage in senseless rituals (compulsions)
Typical age of onset is early adulthood
Prevalence seems to be increasing, but may be due to
changes in clinicians' and researchers' diagnostic tendencies
Etiology of anxiety disorders
Biological factors
May be weak genetic predisposition
Associated with inhibited temperament in infants
Anxiety sensitivity may make people vulnerable to
anxiety disorders
Has been linked to neurochemical activity in brain
Neurotransmitters: chemicals that carry
signals from one neuron to another
Disturbances in neural circuits using GABA may play
role
Conditioning and learning
Many anxiety responses may be acquired through classical
conditioning, maintained through operant conditioning
Martin Seligman's concept of preparedness helps explain
the tendency to develop phobias of certain objects
Suggests that people may be biologically prepared to
acquire some fears (e.g., snakes, spiders)
Only modest research support
Conditioning models have number of problems
Cognitive factors
Certain styles of thinking may make some people
vulnerable to anxiety disorders
Theorists suggest these people tend to:
Misinterpret harmless situations as threatening
Focus excessive attention on perceived threats
Selectively recall information that seems threatening
Personality
Neuroticism correlated with an elevated prevalence of
anxiety disorders
Mechanisms underlying association are subject of debate
Stress
Anxiety disorders may be stress related
High stress may help precipitate onset of anxiety
disorders
Somatoform disorders
Psychosomatic diseases versus somatoform disorders
Psychosomatic diseases: genuine physical
ailments caused in part by psychological factors, especially emotional
stress
Include maladies such as ulcers, asthma, high blood
pressure
Recorded on DSM axis for physical problems (Axis III)
Somatoform disorders: physical ailments with no
authentic organic basis that are due to psychological factors
Recorded on AXIS I (clinical syndromes) of DSM
Symptoms are more imaginary than real, although people
are not simply faking
Somatization disorder is marked by a history of
diverse physical complaints that appear to be psychological in origin
Occur mostly in women, and often in conjunction with
depression or generalized anxiety disorder
Diversity of victims' complaints is distinguishing feature
Conversion disorder is characterized by a
significant loss of physical function, with no apparent organic basis,
usually in a single organ system
Common symptoms include loss of vision, hearing; paralysis
People with conversion disorders usually troubled by more
severe ailments than people with somatization disorders
Hypochondriasis: (more widely known as
hypochondria) is characterized by excessive preoccupation with health
concerns and incessant worry about developing physical illnesses
People tend to over-interpret every conceivable
sign of illness
Frequently coexists with other psychological disorders,
especially anxiety disorders, depression
Etiology of somatoform disorders
Inherited aspects of physiological functioning may
predispose some people to somatoform disorders
Personality factors
Often associated with histrionic personality
characteristics
Neuroticism may also play a role
The sick role
Some people grow fond of role associated with being sick
Benefits or role include being able to avoid life's
challenges, getting attention from others
Dissociative disorders (a class of disorders in
which people lose contact with portions of their consciousness or memory,
resulting in disruptions in their sense of identity)
Dissociative amnesia and fugue
Dissociative amnesia: a sudden loss of memory
for important personal information that is too extensive to be due to
normal forgetting
Memory loss may occur for single traumatic event, or for
extended period of time surrounding the event
Cases have been observed as a result of disasters,
accidents, combat stress, physical abuse, etc.
Dissociative fugue: people experience extensive
amnesia and confusion about their identity, coupled with unexpected travel
away from their customary home
Dissociative identity disorder(the disorder
formerly known as multiple-personality disorder or MPD) involves the
coexistence in one person of two or more largely complete, and usually very
different, personalities
Formal name changed in recent version of DSM, but more
widely known by its traditional name of MPD
A rare disorder
Various personalities often unaware of each other
Appears that a handful of clinicians have begun
over-diagnosing the disorder
Etiology of dissociative disorders
Dissociative amnesia, fugue usually attributed to
excessive stress
Relatively little is known about why such an extreme
reaction occurs in tiny minority of people vSpeculation that certain
personality traits may make some people more susceptible (e.g., fantasy
proneness)
Causes of MPD are obscure
Some skeptics suggest that people fake the disorder
Although some faking occurs, most theorists believe at
least some cases are authentic
May be associated with severe emotional trauma in
childhood
Mood disorders: a class of disorders marked by
emotional disturbances that may spill over to disrupt physical, perceptual,
social, and thought processes
Introduction
Tend to be episodic in nature
Episodes of disturbance vary greatly in length; typically
last several months
Major depressive disorder is marked by persistent
feelings of sadness and despair and a loss of interest in previous sources
of pleasure
Negative emotions main symptom
Other symptoms include reduced appetite, insomnia, lack of
energy
A relatively common disorder
Recent studies indicate that as many as 17% of Americans
endure a depressive disorder at some time
Prevalence is increasing, particularly for people born
since World War II
About twice as common in women as in men
Gender gap opens up during middle to late adolescence
Many possible explanations have been offered
Bipolar disorders (formerly known as
manic-depressive disorders) marked by the experience of both depressed and
manic periods
Manic episodes characterized by elevated mood, high
self-esteem, optimism, energy
Much less common than unipolar depression
Seen equally often in men and women
Etiology of mood disorders
Genetic vulnerability
Evidence indicates genetic factors influence likelihood
of developing disorder
Concordance rate: the percentage of twin pairs
or other pairs of relatives that exhibit the same disorder
Twin studies, which compare identical and fraternal
twins, suggest that genetic factors are involved
Concordance rates average around 67% for identical
twins, 15% for fraternal twins
Neurochemical factors
Correlations found between mood disorders and levels of
two neurotransmitters in brain (norepinephrine, serotonin)
Drug therapies are fairly effective in treatment
Cognitive factors
Explanatory styles may play a role;
pessimistic explanatory style, learned helplessness or a sense of
hopelessness may be cognitive styles that contribute to elevated
vulnerability to depression.
Research indicates that people who consistently tend to
make internal, stable, and global attributions are more
prone to depression
Depressed people who ruminate about their
depression tend to stay depressed longer
Interpersonal roots
Inadequate social skills may put people on road to
depression
Depressed people tend not to be enjoyable companions
Precipitating stress
Evidence indicates moderately strong link between stress
and onset of mood disorders
Stress may also affect how people with mood disorders
respond to treatment
Stress may trigger mood disorders in people who are
vulnerable
Schizophrenic disorders: a class of disorders marked
by disturbances in thought that spill over to affect perceptual, social, and
emotional processes
Introduction
Estimates suggests it occurs in about 1-1.5% of population
A severe, debilitating disorder
General symptoms
Irrational thought
Delusions: false beliefs that are maintained
even though they clearly are out of touch with reality
Thinking becomes chaotic
Deterioration of adaptive behavior
Distorted perception
Hallucinations: sensory perceptions that occur
in the absence of a real, external stimulus or that represent gross
distortions of perceptual input
Auditory hallucinations are most common
Disturbed emotion
Some victims show flattening of emotions
Others show inappropriate emotional responses
Some become emotionally volatile
Four subtypes
Paranoid schizophrenia: dominated by delusions
of persecution, along with delusions of grandeur
Catatonic schizophrenia: marked by striking
motor disturbances, ranging from muscular rigidity to random motor
activity
Disorganized schizophrenia: marked by a
particularly severe deterioration of adaptive behavior
Undifferentiated schizophrenia: marked by
idiosyncratic mixtures of schizophrenic symptoms
Some researchers (e.g., Nancy Andreasen) have proposed
alternative approach to sub-typing based on predominance of negative
versus positive symptoms
Negative symptoms involve behavior deficits (e.g.,
flattened emotions, social withdrawal)
Positive symptoms involve behavioral excesses or
peculiarities (e.g., hallucinations, delusions)
Course and outcome
Disorders usually emerge during adolescence, early
adulthood
Emergence may be sudden or gradual
Factors related to favorable prognosis
Onset was sudden rather than gradual
Onset occurred at later age
Patient was well adjusted prior to onset
Patient has healthy, supportive family to return to
Etiology of schizophrenia
Genetic vulnerability
Much evidence for role of hereditary factors
People seem to inherit genetically transmitted
vulnerability
Neurochemical factors
Associated with changes in neurotransmitter activity in
brain
Excess dopamine activity implicated, although
evidence is riddled with inconsistencies
Structural abnormalities in brain
Problems with attention suggest that disorders may be
caused by neurological defects
Evidence suggests association between enlarged brain
ventricles and chronic schizophrenia
Particularly true for male patients
Significance of evidence is hotly debated
Researchers currently intrigued by finding that thalamus
is smaller and shows less metabolic activity in schizophrenic patients
The Neurodevelopmental Hypothesis
This hypothesis proposes that schizophrenia is produced
by a series of disruptions in the normal development of the brain
The suspected causes of these disruptions are exposure
to viruses during prenatal development, malnutrition, and obstetrical
complications
Expressed emotion
Expressed emotion is degree to which relatives
are highly critical, emotionally over-involved
Relapse rates are much greater for patients returning to
families high in expressed emotion
Patients suffering from mood disorders whose families
are high in expressed emotion also show elevated relapse rates
Precipitating stress
Stress seems to play role in triggering the disorder
High stress may also trigger relapses
Psychological Disorders and the Law
Insanity
Insanity is a legal status indicating that a
person cannot be held responsible for his or her actions because of metal
illness.
This is an issue because criminal acts must be
intentional.
There is no simple way to establish insanity
Most people with psychological diagnoses would not
qualify as insane
The most widely used rule for establishing insanity is
the M'naghten rule, which states that insanity exists when a mental
disorder makes a person unable to distinguish between right and
wrong
People tend to vastly overestimate the use of the
insanity defense, it is rarely used, and when used, rarely succeeds
Involuntary Commitment
In involuntary commitment people are hospitalized in
psychiatric facilities against their will. In order for this to
occur, a mental health professional and legal authority must certify that
the person is:
A danger to his or her self
A danger to others
In need of treatment due to severe disorientation vIn
emergencies, mental health professionals can order a temporary
commitment, but extensive involuntary hospitalization requires court
proceedings
Application: Understanding eating disorders (severe
disturbances in eating behavior characterized by preoccupation with weight and
unhealthy efforts to control weight)
Anorexia nervosa (involves intense fear of gaining
weight, disturbed body image, refusal to maintain normal weight, and
dangerous measures to lose weight)
Two subtypes
Restricting type characterized by tendency to
drastically reduce intake of food, sometimes to point of starvation
Binge-eating purging type involves attempts to
lose weight by deliberately vomiting after meals, misusing laxatives and
diuretics, and engaging in excessive exercise
Both types entail a disturbed body image, which results in
relentless decline in body weight
Leads to variety of medical problems, including amenorrhea
(loss of menstrual cycles in women), gastrointestinal problems, low blood
pressure, etc.
Leads to death in 2-10% of patients
Often coexists with other psychological disorders (e.g.,
depression, anxiety disorders)
Bulimia nervosa (involves habitually engaging in
out-of-control overeating followed by unhealthy compensatory efforts, such
as self-induced vomiting, fasting, abuse of laxatives and diuretics, and
excessive exercise)
Eating binges usually carried out in secret, followed by
intense guilt
Feelings motivate ill-advised strategies to undo the
effects of overeating
People suffering from bulimia nervosa typically maintain
reasonably normal body weight
Medical problems include amenorrhea, dental problems,
metabolic deficiencies, etc.
Shares many features with anorexia nervosa (e.g., morbid
fear of becoming obese)
Different than anorexia nervosa in crucial ways
Bulimia is less life-threatening
Bulimics are more likely to recognize that eating
behavior is pathological, cooperate with treatment
History and prevalence
Although disorder is not new, it did not become a common
affliction until middle part of 20th century
Anorexia, bulimia are product of modern, affluent Western
culture
About 90-95% of sufferers are female
Appears to be result of cultural pressures
Prevalence of disorders also elevated in groups that
place undue emphasis on thinness (e.g., fashion models, dancers)
Prevalence has increased dramatically in recent decades,
although it might be leveling off
Etiology of eating disorders
Genetic vulnerability
Evidence not as strong as it is for other types of
psychopathology
But genetic predisposition may exist
Personality factors
Most victims of anorexia tend to be obsessive, rigid,
neurotic, emotionally restrained; victims of bulimia tend to be
impulsive, overly sensitive, low in self-esteem
Most of these personality traits are influenced by
genetics
Cultural values
Contribution can hardly be overestimated
Western society's emphasis on thinness, attractiveness
in women plays a role
The role of the family
Some theorists suggest overly involved parents may have
an influence
Other theorists argue that parents of adolescents with
eating disorders tend to define their children's needs for them
Cognitive factors
Cognitive theorists emphasize role of disturbed thinking
Additional research is needed to determine whether
disturbed thinking is a cause or merely a symptom of eating disorders
The role of dieting
History of dieting is viewed as risk factor
Dieting is only important in conjunction with other
factors (e.g., vulnerability, stress)
Course and outcome
Variety of therapies have been applied, with mixed results
About 40-50% experience full recovery
Treatment largely a failure for about 20-25% of patients
Remaining patients fall somewhere in between
Prognosis is somewhat better for bulimia than for anorexia