Unit 5: Mental and Physical Health

Topic 5.3: Explaining and Classifying Psychological Disorders

The Big Picture: Defining the Line Between Normal and Disordered

What exactly transforms a quirky behavior or an emotional struggle into a diagnosable psychological disorder? Mental health professionals rely on a combination of highly specific criteria and foundational perspectives to figure out where a normal behavior ends and a psychological disorder begins. In the real world, most psychologists employ an Eclectic Approach, using more than one psychological perspective when diagnosing and treating their clients, recognizing that the human mind is complex and multifaceted.

1. Identifying Psychological Disorders

Diagnosing a disorder is not about simply identifying a strange behavior. Professionals evaluate specific factors to determine if an individual's behaviors and mental processes cross the line into a disorder. These primarily include:

• Dysfunction: This refers to thoughts, emotions, or behaviors that actively interfere with a person's ability to function effectively in their daily life. (Example: Having a phobia of germs that is so intense you cannot leave the house to go to work).
• Distress: This is a state of significant emotional discomfort or suffering. A true disorder usually causes severe inner turmoil for the individual experiencing it.
• Deviation from Social Norms: This occurs when an individual's thoughts, emotions, or behaviors significantly differ from culturally accepted expectations or rules of behavior within a group. It is important to note that Social Norms differ drastically across different cultures, so what is considered a "deviation" in one society might be perfectly normal in another.

2. The Diagnostic Tools and Their Consequences

Diagnosing psychological disorders requires specialized training and the strict use of evidence-based tools. The two primary manuals used worldwide are updated regularly to be responsive to new research and practice advances:

• Diagnostic and Statistical Manual of Mental Disorders (DSM): Developed by the American Psychiatric Association, this is the primary manual used in the United States to classify and diagnose mental disorders based on standardized criteria.
• International Classification of Mental Disorders (ICD): Developed by the World Health Organization, this system classifies diseases and health conditions, including mental and behavioral disorders, globally.

While assigning a clinical label to a patient can be incredibly helpful for creating a treatment plan, diagnosing or classifying psychological disorders has both positive and negative consequences. A formal diagnosis can unfortunately lead to Stigma (a negative label attached to individuals with disorders). This stigma is often compounded by cultural/societal norms and can intersect with systemic issues like Racism, Sexism, Ageism, and broad Discrimination, causing unfair prejudice toward the individual being diagnosed.

3. How Different Perspectives Explain Disorders

Different branches of psychology view the root cause of psychological disorders through entirely different lenses:

• Behavioral Perspective: Proposes that disorders are the result of maladaptive learned associations and behaviors acquired through conditioning.
• Psychodynamic Perspective: Proposes that disorders stem from unconscious conflicts, unresolved childhood experiences, and internal psychological processes.
• Humanistic Perspective: Proposes that disorders focus on a lack of social support and being unable to fulfill one's potential or achieve self-acceptance.
• Cognitive Perspective: Proposes that disorders are the result of maladaptive thoughts, beliefs, attitudes, or ways of interpreting experiences.
• Evolutionary Perspective: Proposes that causes of disorders focus on behaviors and mental processes that, in the modern world, reduce the likelihood of survival.
• Sociocultural Perspective: Proposes that disorders stem from maladaptive social and cultural relationships, expectations, and dynamics.
• Biological Perspective: Proposes that the root of a mental disorder is physiological, biochemical, neurological, or genetic in nature.

4. The Interaction Models

Because humans are complex, modern psychology often relies on comprehensive models that combine multiple elements rather than looking through just one lens:

• Biopsychosocial Model: An approach that assumes any psychological problem potentially involves a combination of biological (genetics), psychological (thoughts/emotions), and sociocultural (environment/culture) factors.
• Diathesis-Stress Model: This specific model assumes that mental disorders develop due to a combination of a genetic vulnerability (the diathesis) and stressful life experiences (the stress). Even if you have the genetic code for a disorder, it might never appear unless triggered by a traumatic or stressful event.

5. Don't Trip Up! (Common Misconceptions)

⚠️ Biopsychosocial vs. Diathesis-Stress: These two sound incredibly similar, but there is a key distinction to watch out for. The Biopsychosocial Model is a broad umbrella looking at the intersection of body, mind, and environment. The Diathesis-Stress Model specifically deals with a dormant genetic vulnerability (diathesis) that must be "turned on" or triggered by a specific environmental stressor.

6. Level Up Your Score: Interactive Review

Classifying disorders requires mastering the different perspectives and the specific criteria for diagnosing. Test your knowledge below:

• Flashcard Drill: Head to our Flashcards page to review all the different psychological perspectives and diagnostic tools like the DSM and ICD.
• Psych Land Board Game: Test how well you can apply the perspectives to real-world scenarios by playing a round of Psych Land.
• Topic 5.3 Quiz: Verify your mastery of the Diathesis-Stress model and the criteria for dysfunction with our adaptive quiz before moving on to specific disorder categories.