😵Abnormal Psychology Unit 2 – Theories of Abnormal Behavior

Key Concepts and Definitions

• Abnormal behavior deviates from social norms, causes distress, and impairs functioning
• Mental disorders are patterns of abnormal behavior, cognition, and emotion that cause significant distress or impairment
  • Classified using the Diagnostic and Statistical Manual of Mental Disorders (DSM) or the International Classification of Diseases (ICD)
• Etiology refers to the causes or origins of a mental disorder, which can be multifactorial
• Comorbidity occurs when an individual has two or more mental disorders simultaneously
• Stigma involves negative attitudes, beliefs, and behaviors towards individuals with mental disorders
• Psychopathology is the scientific study of mental disorders, their causes, and their treatments
• Prevalence refers to the proportion of a population affected by a mental disorder at a given time

Historical Perspectives

• Ancient civilizations attributed mental disorders to supernatural causes (possession by evil spirits or punishment from gods)
• Hippocrates (460-377 BCE) proposed that mental disorders had natural causes and originated in the brain
• During the Middle Ages, mental disorders were often viewed as a result of witchcraft or demonic possession, leading to persecution
• In the 18th century, moral treatment emerged, emphasizing humane care and the belief that mental disorders could be treated
• The 19th century saw the development of asylums and the rise of psychiatry as a medical specialty
• Sigmund Freud (1856-1939) introduced psychoanalytic theory, emphasizing the role of unconscious conflicts in mental disorders
• The 20th century brought advancements in biological treatments (psychotropic medications) and psychological therapies (cognitive-behavioral therapy)

Major Theoretical Models

• The biological model emphasizes the role of genetic, neurochemical, and neuroanatomical factors in mental disorders
  • Suggests that imbalances in neurotransmitters (serotonin, dopamine) contribute to conditions like depression and schizophrenia
• The psychodynamic model, based on Freud's theories, focuses on unconscious conflicts, early childhood experiences, and defense mechanisms
  • Proposes that unresolved conflicts and traumas can manifest as mental disorders
• The behavioral model emphasizes the role of learning and environmental factors in shaping behavior
  • Suggests that mental disorders result from maladaptive learned behaviors through classical and operant conditioning
• The cognitive model focuses on the impact of thoughts, beliefs, and information processing on emotions and behaviors
  • Proposes that distorted thinking patterns contribute to mental disorders (negative self-talk in depression)
• The diathesis-stress model integrates biological vulnerability (diathesis) and environmental stressors in the development of mental disorders
• The biopsychosocial model considers the complex interplay of biological, psychological, and social factors in mental health and illness

Biological and Genetic Factors

• Genetic factors contribute to the development of many mental disorders, as evidenced by family, twin, and adoption studies
  • Heritability estimates vary across disorders (schizophrenia ~80%, depression ~40%)
• Neurotransmitter imbalances are implicated in various mental disorders
  • Serotonin deficiency is associated with depression, while dopamine excess is linked to schizophrenia
• Structural and functional brain abnormalities are observed in individuals with mental disorders
  • Reduced hippocampal volume in depression and enlarged ventricles in schizophrenia
• Endocrine and immune system dysfunctions are linked to mental disorders
  • Hypothalamic-pituitary-adrenal (HPA) axis dysregulation in stress-related disorders
• Epigenetic modifications, such as DNA methylation and histone modification, can influence gene expression and mental health
• Gene-environment interactions highlight the complex interplay between genetic predispositions and environmental factors in mental disorders

Psychological and Social Influences

• Early childhood experiences, such as attachment styles and trauma, can impact mental health throughout life
  • Insecure attachment and adverse childhood experiences (ACEs) increase the risk of mental disorders
• Personality traits, such as neuroticism and introversion, are associated with a higher risk of certain mental disorders (depression, anxiety)
• Cognitive factors, including negative thinking patterns and attributional styles, contribute to the development and maintenance of mental disorders
• Social support and interpersonal relationships play a crucial role in mental health
  • Lack of social support and social isolation are risk factors for mental disorders
• Socioeconomic factors, such as poverty, unemployment, and discrimination, can impact mental health
• Cultural factors influence the expression, interpretation, and treatment of mental disorders
  • Cultural beliefs and practices shape the experience and understanding of mental illness

Assessment and Diagnosis

• Clinical interviews are the primary tool for gathering information about an individual's symptoms, history, and functioning
  • Structured interviews (SCID) and semi-structured interviews (MINI) are commonly used
• Psychological testing involves the use of standardized measures to assess cognitive abilities, personality traits, and symptom severity
  • Examples include the Minnesota Multiphasic Personality Inventory (MMPI) and the Beck Depression Inventory (BDI)
• Behavioral observations and self-monitoring can provide valuable information about an individual's symptoms and behaviors in real-life contexts
• Diagnostic criteria, as outlined in the DSM and ICD, are used to classify mental disorders based on specific symptoms and duration
• Differential diagnosis involves distinguishing between disorders with similar presentations and ruling out medical conditions that may mimic mental disorders
• Assessment and diagnosis are ongoing processes that may require revision as new information emerges or symptoms change over time

Treatment Approaches

• Psychotherapy involves the use of psychological techniques to treat mental disorders and improve well-being
  • Cognitive-behavioral therapy (CBT) focuses on modifying maladaptive thoughts and behaviors
  • Psychodynamic therapy explores unconscious conflicts and early experiences
• Pharmacotherapy involves the use of medications to manage symptoms of mental disorders
  • Antidepressants (SSRIs) are used to treat depression and anxiety disorders
  • Antipsychotics are used to manage symptoms of schizophrenia and other psychotic disorders
• Electroconvulsive therapy (ECT) is a medical treatment that involves inducing seizures to alleviate severe depression or other mental disorders
• Transcranial magnetic stimulation (TMS) is a non-invasive brain stimulation technique used to treat depression
• Psychosocial interventions, such as social skills training and family therapy, can complement individual treatment and improve functioning
• Integrated and personalized treatment plans often combine multiple approaches tailored to an individual's specific needs and preferences

Current Research and Future Directions

• Advances in neuroimaging techniques (fMRI, PET) are providing new insights into the neural basis of mental disorders
  • Identifying brain circuits involved in specific disorders can inform targeted treatments
• Genetic research is focused on identifying specific genes and gene variants associated with mental disorders
  • Genome-wide association studies (GWAS) and whole-genome sequencing are key approaches
• Precision medicine aims to tailor treatments based on an individual's genetic, biological, and environmental factors
• Translational research seeks to bridge the gap between basic science findings and clinical applications
  • Developing animal models of mental disorders to test new treatments
• Digital mental health interventions, such as mobile apps and online therapy, are expanding access to care
• Research on the gut-brain axis is exploring the role of the microbiome in mental health and the potential for novel treatments
• Efforts to reduce stigma and improve public understanding of mental disorders are crucial for promoting help-seeking and improving outcomes