Psychology · Class 12 · Psychological Disorders · 4.º Período

Concepts of Abnormality and Psychological Disorders

An examination of the historical background and current perspectives on abnormal behaviour. Students will learn about the diathesis-stress model and the classification systems like DSM and ICD.

TL;DR:What does it mean to be 'abnormal'? This topic explores the thin and often blurry line between normal and abnormal behaviour. Students learn the 'Four Ds', Deviance, Distress, Dysfunction, and Danger, used by psychologists to define abnormality. They also look at the historical journey of how mental illness was viewed, from ancient 'supernatural' beliefs to the modern 'biopsychosocial' approach. The Diathesis-Stress Model is introduced to explain how a biological predisposition combined with environmental stress can trigger a disorder.

• CBSE Learning Outcomes
• CBSE Class 12 Psychology, Unit 4: Psychological Disorders
• NCERT Class 12 Psychology, Chapter 4: Psychological Disorders - Concepts of Abnormality and Psychological Disorders

About This Topic

What does it mean to be 'abnormal'? This topic explores the thin and often blurry line between normal and abnormal behaviour. Students learn the 'Four Ds', Deviance, Distress, Dysfunction, and Danger, used by psychologists to define abnormality. They also look at the historical journey of how mental illness was viewed, from ancient 'supernatural' beliefs to the modern 'biopsychosocial' approach. The Diathesis-Stress Model is introduced to explain how a biological predisposition combined with environmental stress can trigger a disorder.

In India, mental health still carries a significant social stigma. This topic is crucial for sensitising students and breaking myths. By studying classification systems like the DSM-5 and ICD-11, students see that psychological disorders are medical and psychological conditions that require professional help, not 'character flaws' or 'curses'. This topic comes alive when students can physically model the patterns of the Diathesis-Stress model through interactive diagrams.

Key Questions

1. What criteria are used to define abnormal behaviour?
2. How does the diathesis-stress model explain the onset of psychological disorders?
3. Why is the classification of psychological disorders necessary?

Watch Out for These Misconceptions

Common Misconception

Abnormal people are always 'crazy' or dangerous.

What to Teach Instead

Most people with psychological disorders are not dangerous. Using the 'Four Ds' helps students see that 'Distress' and 'Dysfunction' are much more common indicators than 'Danger'.

Common Misconception

Mental illness is caused by a single 'bad' event.

What to Teach Instead

The Diathesis-Stress model shows it's a combination of nature and nurture. A 'balancing scale' activity helps students visualise how multiple factors contribute to mental health.

Active Learning Ideas

Think-Pair-Share

Defining the 'Normal'

Students discuss: 'Is it abnormal to talk to yourself?' They then apply the 'Four Ds' to this behaviour to see how context (e.g., rehearsing a speech vs. responding to hallucinations) changes the definition.

20 min·Pairs

Gallery Walk

History of Abnormality

Create a timeline around the room showing the Supernatural, Biological, and Psychological periods. Groups add notes on how 'treatment' changed in each era, from trephination to modern therapy.

40 min·Small Groups

Simulation Game

The Diathesis-Stress Model

Using two containers (representing two people), students add 'marbles' (biological vulnerability). They then pour 'water' (environmental stress). They observe how the one with more 'marbles' overflows (develops a disorder) sooner.

30 min·Small Groups

Frequently Asked Questions

What are the 'Four Ds' of abnormal behaviour?

The Four Ds are: Deviance (different from social norms), Distress (unpleasant to the person), Dysfunction (interfering with daily life), and Danger (to self or others).

What is the Diathesis-Stress Model?

This model suggests that a psychological disorder develops when a person has a biological predisposition (diathesis) for the disorder, which is then 'triggered' by environmental stressors.

What are the best hands-on strategies for teaching about abnormality?

Case study analysis is the most effective hands-on strategy. By giving students anonymised descriptions of behaviour and asking them to apply the 'Four Ds', they learn to think like clinicians. This active application helps remove the 'mystery' and 'fear' often associated with psychological disorders.

Why do we need classification systems like DSM and ICD?

Classification systems provide a common language for doctors and researchers. They ensure that a diagnosis like 'Depression' means the same thing in Delhi as it does in New York, allowing for consistent treatment and research.