Unit 5.3 Review – Explaining and Classifying Psychological Disorders

Unit 5.3 Review – Explaining and Classifying Psychological Disorders

Verified for 2025 AP® Psychology Exam

Overview

Unit 5.3 explains how psychologists identify, diagnose, and understand psychological disorders using various models and perspectives. It also explores how biological, psychological, and social factors interact to shape mental health.

1. How Do Psychologists Identify a Psychological Disorder? 🧠

Not every weird or upsetting behavior counts as a disorder — psychologists look at a few main criteria to make the call.

Criteria to Identify a Disorder

  • Dysfunction: Interferes with daily life (e.g., work, hygiene, school)

  • Distress: Causes emotional suffering (to the person or others around them)

  • Deviance: Behavior goes against social/cultural norms

Important:

  • No one factor is enough by itself. It’s about the whole picture.

  • Mental health lies on a spectrum. Not black-and-white.

2. Why Diagnosing Matters (and Sometimes Backfires) 🌟

Classifying a disorder can trigger treatment and support — but it can also lead to misunderstanding and bias.

Positives of Diagnosis

  • Gives people clarity and a path toward treatment

  • Helps professionals design structured treatment plans

  • Opens up access to therapy, medication, and care

  • Reduces shame by showing it’s not personal weakness

Risks of Diagnosis

  • Stigma: Patients may feel labeled, embarrassed, or judged

  • Discrimination: Stereotypes can lead to unfair treatment (race, gender, age, etc.)

  • Cultural Variation: Some cultures view mental health differently, which can affect understanding or acceptance

  • Possible social limits (impacting jobs, school, relationships, etc.)

3. How Are Disorders Diagnosed? 🧰

Diagnosis isn’t done casually — it requires expert tools and trained mental health professionals.

Major Diagnostic Tools

  • DSM: Diagnostic and Statistical Manual of Mental Disorders

    • Made by the APA (American Psychiatric Association)

    • Used mainly in the U.S.

    • Regularly updated (currently DSM-5)

  • ICD: International Classification of Diseases

    • Created by the WHO (World Health Organization)

    • Used around the world

    • Also updated over time

These systems help keep diagnoses consistent, evidence-based, and more universally understood.

4. Different Perspectives on the Causes of Mental Disorders 🔍

There’s no single explanation for why people develop mental disorders — each psychological perspective offers a different lens on mental illness.

Eclectic Approach

  • Most psychologists use a mix of approaches to match each client’s needs

Major Psychological Perspectives

Behavioral Perspective

  • Mental illness = learned behavior

  • Result of conditioning (classical or operant)

  • Focuses on changing behavior through retraining

Cognitive Perspective

  • Cause = faulty or negative thinking

  • Cognitive distortions can lead to anxiety or depression

  • Treatment focuses on restructuring thought patterns

Psychodynamic Perspective

  • Focuses on the unconscious mind

  • Disorders linked to childhood and unresolved conflicts

  • Therapy aims to make the unconscious conscious

Humanistic Perspective

  • Mental health struggles tied to blocked personal growth or unmet needs

  • Support, purpose, and personal fulfillment are central

Biological Perspective

  • Cause = genetic or physiological issues

  • Mental illness is treated with medication or physical interventions

Evolutionary Perspective

  • Traits that helped our ancestors now may create problems

  • Example: Anxiety used to help us survive, now causes stress

Sociocultural Perspective

  • Mental health is shaped by one’s environment, culture, and relationships

  • Poverty, discrimination, and cultural norms play a role

5. Interaction Models: Where Everything Comes Together 🔄

Disorders usually aren’t caused by just one factor. These models explain how multiple influences combine.

Biopsychosocial Model

  • Biological: Genetics, brain structure, physical health

  • Psychological: Thoughts, emotions, behavior patterns, coping skills

  • Social: Environment, family, culture, community

This is the most widely accepted approach today.

Diathesis-Stress Model

  • Diathesis: Genetic predisposition to a disorder

  • Stress: Life events or environmental triggers

  • Together, they can lead to the development of a mental disorder

  • Example: You may inherit depression risk, but it doesn’t surface unless triggered by trauma or stress

Key Takeaways

Psychological disorders are identified based on dysfunction, distress, and deviation from social norms.

Diagnosis can help guide treatment but may also lead to stigma or discrimination.

The DSM (used in the U.S.) and ICD (used internationally) are the main classification systems for diagnosing disorders.

Most psychologists use an eclectic approach that pulls from multiple psychological perspectives.

Different perspectives explain mental disorders through factors like learned behavior, cognition, unconscious conflict, biology, evolution, and cultural influences.

The biopsychosocial model combines biological, psychological, and sociocultural causes.

The diathesis-stress model explains how a genetic predisposition can lead to a disorder when combined with stressful life events.