Defining Psychological Disorders: Concepts, Terminology, and Diagnostic Methods

Defining Psychological Disorders

What is a Psychological (Mental) Disorder?

A psychological disorder is defined as a significant disturbance in cognition, emotion, or behavior that leads to impaired functioning or distress. The concept of 'disorder' is central to clinical psychology and psychiatry, and is used to identify patterns of abnormal behavior or mental processes.

• Maladaptive: Behaviors that are destructive physically, emotionally, or socially, and interfere with daily functioning.

• Disturbing: Behaviors that are upsetting or distressing to the person or others.

• Atypical: Behaviors that go against typical cultural norms or expectations.

Example: Persistent sadness that interferes with work and relationships may be considered maladaptive and disturbing, and could indicate a psychological disorder.

Additional info: There is no single, universally agreed-upon definition or criteria for what constitutes a psychological disorder; diagnosis often depends on context and cultural norms.

Clarifying Terminology in Psychopathology

Key Terms and Their Definitions

Understanding psychological disorders requires familiarity with several key terms:

• Psychopathology: The study of psychological disorders, including their symptoms, causes, and treatments.

• Symptom: Behaviors, thoughts, or emotions that may indicate the presence of a disorder.

• Diagnosis: A determination by a professional as to whether a disorder is present, based on established diagnostic criteria.

Example: A psychologist may diagnose a patient with depression after observing symptoms such as persistent sadness, loss of interest, and changes in sleep patterns.

Diagnostic Methods for Psychological Disorders

Standardized Diagnostic Manuals

Psychologists and researchers use standardized manuals to ensure consistency in diagnosing psychological disorders. The two most widely used manuals are:

DSM-5 (Diagnostic and Statistical Manual of Mental Disorders)	ICD-11 (International Classification of Diseases)
First published in 1952; currently in its 5th edition. Published by the American Psychiatric Association. Focuses on mental disorders, criteria, typical age of onset, prevalence, symptoms, and treatment. Widely used in clinical and research settings in the U.S.	First released in 1948; currently in its 11th edition. Published by the World Health Organization. Includes both mental and physical disorders, not just psychiatric conditions. Used globally for diagnosis, monitoring, and tracking diseases and mortality.

Example: The DSM-5 provides detailed criteria for diagnosing depression, while the ICD-11 includes codes for both mental and physical health conditions.

Additional info: The DSM-5 is primarily used in the United States, while the ICD-11 is used internationally.

Application and Assessment

Criteria for Determining Psychological Disorders

To determine if a behavior or thought is disordered, professionals consider:

• Whether the behavior is disturbing or upsetting to the person.

• If the behavior is maladaptive and impairs functioning.

• Whether the behavior is atypical within the cultural context.

Example: A person who hears voices that others do not (hallucinations) may be considered to have a psychological disorder if the experience is distressing, impairs daily functioning, and is atypical in their culture.

Primary Aim of the DSM-5

• To set the standard of what is normal and what is abnormal.

• To provide diagnostic categories for mental disorders for clinicians and researchers.

• To guide the development of treatment plans and insurance coverage.

Example: Insurance companies may require a DSM-5 diagnosis to approve payment for mental health treatment.

Summary Table: DSM-5 vs. ICD-11

Feature	DSM-5	ICD-11
Publisher	American Psychiatric Association	World Health Organization
Scope	Mental disorders	Mental and physical disorders
Usage	Primarily U.S.	International
Edition	5th (2013)	11th (2018)