Chapter 8 (Pp ) Mood Disorders and Suicide

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Presentation transcript:

Chapter 8 (Pp 259-270) Mood Disorders and Suicide

CAUSAL FACTORS IN DEPRESSIVE DISORDERS

Stress and Depression Stress plays an important role in determining vulnerability in bipolar disorder and even more strongly in major depression. Sources of stress may include: The loss of a loved one The breakup of a romantic relationship Prolonged unemployment Physical illness Marital or relationship problems Economic hardship Pressure at work Exposure to racism and discrimination Living in an unsafe Distressed neighborhood

Psychodynamic Theories The classic psychodynamic theory of depression of Freud (1917/1957) and his followers (e.g., Abraham, 1916/1948) holds that depression represents anger directed inward rather than against significant others. Freud believed that mourning, or normal bereavement, is a healthy process by which one eventually comes to separate oneself psychologically from a person who is lost through death, separation, divorce, or other reason. From the psychodynamic viewpoint, bipolar disorder represents shifting dominance of the individual’s personality between the ego and superego.

Research Evidence Psychodynamic theorists focus on the role of loss in depression. Research does show that loss of significant others (through death or divorce, for example) is often associated with the development of depression. Evidence supports the view that a self-focusing style—an inward or self-absorbed focus of attention—is associated with depression, especially in women.

Humanistic Theories From the humanistic framework, people become depressed when they cannot imbue their existence with meaning and make authentic choices that lead to self-fulfillment. Like psychodynamic theorists, humanistic theorists focus on the loss of self-esteem that can arise when people lose friends or family members or suffer occupational setbacks. We tend to connect our personal identity and sense of self-worth with our social roles as parents, spouses, students, or workers.

Learning Theories Whereas the psychodynamic perspectives focus on inner, often unconscious, causes, learning theorists emphasize situational factors, such as the loss of positive reinforcement. We perform best when levels of reinforcement are commensurate with our efforts. Changes in the frequency or effectiveness of reinforcement can shift the balance so that life becomes unrewarding.

The Role of Reinforcement Learning theorist Peter Lewinsohn (1974) proposed that depression results from an imbalance between behavior and reinforcement. A lack of reinforcement for one’s efforts can sap motivation and induce feelings of depression. Inactivity and social withdrawal reduce opportunities for reinforcement; lack of reinforcement exacerbates withdrawal.

Interactional Theory Difficulties in social interactions may help explain the lack of positive reinforcement. Interactional theory, developed by psychologist James Coyne (1976), proposes that the adjustment to living with a depressed person can become so stressful that the partner or family member becomes progressively less reinforcing. Interactional theory is based on the concept of reciprocal interaction.

Cognitive Theories Cognitive theorists relate the origin and maintenance of depression to the ways in which people see themselves and the world around them. One of the most influential cognitive theorists, psychiatrist Aaron Beck (Beck, 1976; Beck et al., 1979), relates the development of depression to the adoption early in life of a negatively biased or distorted way of thinking—the cognitive triad of depression: The view that depression derives from adopting negative views of oneself, the environment or world at large, and the future.

All-or-nothing thinking Overgeneralization Mental filter Psychiatrist David Burns (1980) enumerated a number of the cognitive distortions associated with depression: All-or-nothing thinking Overgeneralization Mental filter Disqualifying the positive Jumping to conclusions Magnification and minimization Emotional reasoning “Should” and “must” statements Labeling and mislabeling Personalization

Research Evidence on Cognitions and Depression Evidence that depressed people show higher levels of distorted or dysfunctional thinking than nondepressed controls supports Beck’s model. We also find that dysfunctional attitudes (above a certain threshold) increase vulnerability to depression in the face of negative life events. Yet, we can’t say whether dysfunctional or negative thinking causes depression or is merely a feature of depression.

Learned Helplessness (Attributional) Theory Learned helplessness - A behavior pattern characterized by passivity and perceptions of lack of control. The originator of the learned helplessness concept, Martin Seligman (1973, 1975), suggests that people learn to perceive themselves as helpless because of their experiences. The learned helplessness model therefore straddles the behavioral and the cognitive: Situational factors foster attitudes that lead to depression.

The reformulated helplessness theory holds that people most vulnerable to depression are those who explain the causes of negative events (such as failure in work, school, or romantic relationships) according to the following three types of attributions: Internal factors, or beliefs that failures reflect their personal inadequacies, rather than external factors, or beliefs that failures are caused by environmental factors. Global factors, or beliefs that failures reflect sweeping flaws in personality rather than specific factors, or beliefs that failures reflect limited areas of functioning. Stable factors, or beliefs that failures reflect fixed personality factors rather than unstable factors, or beliefs that the factors leading to failures are changeable.

Biological Factors

Genetic Factors Genetic factors play a significant role in determining proneness to mood disorders, including major depression and bipolar disorder. Not only does major depression tend to run in families, but the closer the genetic relationship people share, the more likely they are to share a depressive disorder. An emerging model in the field focuses on interactions of genetic and environmental factors in the development of major depression and other mood disorders.

Biochemical Factors and Brain Abnormalities Early research more than 50 years ago showed that drugs we now call antidepressants, which increase levels in the brain of the neurotransmitters norepinephrine and serotonin, often helped relieve depression. Brain-imaging studies show lower metabolic activity in the prefrontal cortex of clinically depressed people as compared to healthy controls. Other research reveals brain abnormalities in people with mood disorders (major depression and bipolar disorder) in parts of the brain involved in governing emotions.

CAUSAL FACTORS IN BIPOLAR DISORDERS In a large population based study in Finland, investigators found the concordance rate to be seven times greater among MZ twins than DZ twins (43% versus 6%, respectively). If bipolar disorder were caused entirely by heredity, then an identical twin of someone having the disorder would always develop the disorder, but this isn’t the case. Consistent with the diathesis–stress model, stressful life factors and other biological influences may interact with a genetic predisposition to increase vulnerability to the disorder.

The Case of Ann (video)

The End