*DSM-5 and diagnosing

Chapter 16 - Psychological Disorders

Diagnosing Psychological Disorders

• The primary goal of diagnosing psychological disorders is to classify and describe mental disorders accurately and consistently.

Reliability vs Validity

• Understanding the concepts of reliability and validity is crucial for effective diagnosis:

  • Reliability

  • Definition: Reliability refers to the consistency of a diagnostic system.

  • Explanation: It implies that different clinicians should agree on diagnoses across various professionals.

  • Key Point: Decisions should be based on observable behaviors that can be reliably detected.

  • Validity

  • Definition: Validity refers to the accuracy of a diagnostic system.

  • Explanation: It signifies that each diagnostic category truly reflects the defining traits of the disorder.

  • Key Point: Diagnostic categories should accurately capture the essential features of each disorder and distinguish them from others.

DSM-5 Overview

• The DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition) is used primarily in North America as a replacement for DSM-IV-TR (2013).

• Contains information on 350+ disorders, accompanied by observable behavioral criteria.

• The International Classification of Diseases (ICD-11) is the equivalent system used in Europe.

Categorical vs. Dimensional Approaches

• There are two predominant approaches to diagnosing psychological disorders:

  • Categorical System

  • Definition: A categorical system places individuals into specific diagnostic boxes.

  • Characteristics:

    • Provides clear criteria for diagnosis.

    • Limitation: Fails to show the severity of disorders or any overlap between different disorders.

    • Explanation: This approach is often described as "Either you have it, or you don't."

  • Dimensional System

  • Definition: A dimensional system rates behaviors along a severity scale.

  • Characteristics:

    • Viewed as disorders existing on a spectrum.

    • Strength: This captures nuances and severity, recognizing that psychological conditions are not simply black-and-white.

    • Limitation: May be less straightforward than categorical systems because it acknowledges that disorders can coexist and vary in intensity.

DSM-5 Personality Trait Dimensions

• The DSM-5 outlines six measurable dimensions of personality dysfunction, which can combine into personality disorders such as Borderline and Antisocial types:

  1. Negative Emotionality: Characterized by distress, anxiety, and depression.

  2. Schizotypy: Involves odd and unusual thinking patterns.

  3. Disinhibition: Associated with impulsivity and acting out behaviors.

  4. Introversion: Defined by social withdrawal and avoidance of intimacy.

  5. Antagonism: Includes traits of hostility and manipulation.

  6. Compulsivity: Marked by perfectionism and rigidity in behaviors.

• Each of these traits contributes to the understanding of personality disorders, highlighting the complexity and variability of human psychology in clinical settings.

DSM IV- TR: The Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision, serves as a key reference for diagnosing various psychological disorders, providing essential criteria for clinicians.

Axis I- Clinical Disorders: This axis includes a range of mental health disorders such as mood disorders, anxiety disorders, and schizophrenia, providing clinicians with a comprehensive framework for diagnosis.

Axis II- Personality Disorders: This axis focuses on long-standing patterns of behavior and inner experiences that deviate from cultural expectations, including conditions such as borderline personality disorder, narcissistic personality disorder, and antisocial personality disorder.

Axis III- Physical Conditions: This axis addresses medical conditions that may affect mental health, such as chronic illnesses, neurological disorders, or significant injuries, highlighting the importance of considering both physical and psychological factors in treatment.

Axis IV- Psychosocial and Environmental Problems: This axis examines the impact of life events and environmental stressors on an individual's mental health, including issues such as unemployment, divorce, living alone, or housing instability.

Axis V- Global Assessment of Functioning: This axis provides a numerical scale (ranging from 0 to 100) to evaluate an individual's overall functioning in social, occupational, and psychological domains, helping to assess the severity of mental illness and guide treatment planning.