The Psychology of Psychopathology. A Complete Guide

OCD Whiteboard Video

Module Title: Biological Explanations of Obsessive-Compulsive Disorder (OCD)

Exploring the genetic and neurological basis of obsessive-compulsive behaviour

This module provides an in-depth exploration of the biological explanations for Obsessive-Compulsive Disorder (OCD), a debilitating anxiety-related condition characterised by persistent intrusive thoughts (obsessions) and repetitive behaviours (compulsions). Understanding the biological basis of OCD helps inform effective diagnosis, treatment, and ongoing research into mental health conditions.

The module examines two key biological approaches to explaining OCD:

1. Genetic Explanations

This section focuses on the role of heredity in the development of OCD. You will explore:

• The role of candidate genes such as SERT (linked to serotonin transport) and COMT (associated with dopamine regulation).

• How polygenic inheritance suggests OCD is influenced by multiple genes, each contributing a small effect.

• Family and twin studies provide evidence of a genetic predisposition to OCD.

Research spotlight: Nestadt et al. (2010) found that first-degree relatives of OCD sufferers have a higher likelihood of developing the disorder, supporting the genetic basis.

2. Neural Explanations

This section examines abnormalities in brain structure and neurochemistry linked to OCD, including:

• Neurotransmitters: The role of low serotonin levels and dysregulation of dopamine in OCD symptoms.

• Brain circuits: Overactivity in the orbitofrontal cortex (OFC) and caudate nucleus, involved in decision-making and impulse control.

Research spotlight: Studies using PET scans (e.g., Saxena & Rauch, 2000) have shown heightened activity in areas of the brain associated with compulsive behaviour.

Students will evaluate the strengths and limitations of the biological approach, considering supporting research, practical applications (such as drug therapy), and ethical considerations. This module also encourages critical comparison with psychological explanations of OCD, laying the foundation for deeper analysis in later sections of the course.

Serotonin and Dopamine in OCD

Part of the Neural and Genetic Explanation in the AQA Specification

Serotonin (5-HT)

Serotonin is a neurotransmitter that plays a key role in mood regulation, anxiety control, and emotion processing.

Role in OCD:

• Low levels of serotonin are believed to contribute to the increased anxiety and intrusive thoughts commonly seen in OCD.

• Serotonin helps regulate other brain functions that are disrupted in OCD, such as impulse control and the ability to filter out irrelevant thoughts.

• Disruption in serotonin pathways may result in the persistent, unwanted obsessions that are characteristic of the disorder.

Evidence:

• The SERT gene (also called 5-HTT) is involved in the reuptake of serotonin in the brain. A mutation in this gene may cause excessive reabsorption, leading to lower availability of serotonin at the synapse.

• Antidepressants like SSRIs (e.g., fluoxetine) that increase serotonin levels often reduce OCD symptoms, suggesting serotonin plays a causal role.

Dopamine

Dopamine is another neurotransmitter associated with reward, motivation, and goal-directed behaviour.

Role in OCD:

• Increased dopamine activity may lead to heightened alertness, hyper-responsivity to stimuli, and repetitive behaviours — all of which are central to OCD.

• Dopamine is also involved in the cortico-striatal-thalamo-cortical (CSTC) circuit, which is thought to be overactive in individuals with OCD.

Evidence:

• The COMT gene regulates the enzyme that breaks down dopamine in the prefrontal cortex. A variation of the COMT gene linked to OCD is associated with lower enzyme activity, resulting in higher dopamine levels.

• Research has shown that dopamine agonists, which increase dopamine activity, can worsen OCD symptoms, supporting the theory that excess dopamine contributes to compulsions.

  
  

This supports a biological basis for OCD, but it’s important to note that not everyone with these neurotransmitter imbalances develops OCD. This suggests that while these factors increase vulnerability, they often interact with environmental triggers, consistent with the diathesis-stress model.

1. Genetic Explanations

This section focuses on the role of heredity in the development of OCD. You will explore:

• The role of candidate genes such as SERT (linked to serotonin transport) and COMT (associated with dopamine regulation).

• How polygenic inheritance suggests OCD is influenced by multiple genes, each contributing a small effect.

• Family and twin studies providing evidence of a genetic predisposition to OCD.

Research spotlight: Nestadt et al. (2010) found that first-degree relatives of OCD sufferers have a higher likelihood of developing the disorder, supporting the genetic basis.

2. Neural Explanations

This section examines abnormalities in brain structure and neurochemistry linked to OCD, including:

• Neurotransmitters: The role of low serotonin levels and dysregulation of dopamine in OCD symptoms.

• Brain circuits: Overactivity in the orbitofrontal cortex (OFC) and caudate nucleus, involved in decision-making and impulse control.

Research spotlight: Studies using PET scans (e.g., Saxena & Rauch, 2000) have shown heightened activity in areas of the brain associated with compulsive behaviour.

Module Title: Biological Treatments for Obsessive-Compulsive Disorder (OCD)

Understanding the use of drug therapies to manage symptoms of OCD

This module explores the use of biological treatments for Obsessive-Compulsive Disorder (OCD), with a primary focus on drug therapy. Based on the understanding that OCD has a biological basis—particularly involving imbalances in brain chemistry and activity—this module examines how pharmacological interventions aim to correct these abnormalities and reduce symptoms of obsessions and compulsions.

Selective Serotonin Reuptake Inhibitors (SSRIs)

The core treatment discussed is the use of SSRIs, a class of antidepressants that work by increasing levels of serotonin in the brain. SSRIs such as fluoxetine (Prozac), sertraline, and paroxetine help regulate mood, reduce anxiety, and diminish obsessive thoughts and compulsive behaviours. The module examines how these medications function at the synaptic level, preventing the reabsorption (reuptake) of serotonin to keep more of it active in the synaptic cleft.

Other Biological Treatments

In cases where SSRIs are ineffective, other options include:

• Tricyclic antidepressants (e.g., clomipramine) – often more potent but associated with more severe side effects.

• SNRIs (Serotonin-Norepinephrine Reuptake Inhibitors) – used less commonly but can benefit patients with co-occurring mood disorders.

• Benzodiazepines – occasionally prescribed for short-term relief of severe anxiety.

Effectiveness and Evaluation

Students will analyse the effectiveness of drug therapy by reviewing empirical evidence from clinical trials and meta-analyses. Key issues such as symptom reduction, relapse rates, and side effects will be critically evaluated. The module also considers the ethical implications and cost-effectiveness of biological treatments in comparison to psychological interventions such as cognitive behavioural therapy (CBT).

By the end of this module, students will have a clear understanding of how biological treatments for OCD work, their strengths and limitations, and the role they play in modern clinical practice.

Video Description:

Struggling with the OCD topic in AQA Psychology? This video is your complete guide to everything you need about Obsessive-Compulsive Disorder for A-Level exams.

Created by The Psychology Tutoring Academy, this lesson breaks down all the key content in a clear, engaging way — perfect for revision or catching up.

What’s Covered in this Video:

• What is OCD? Key symptoms and diagnosis

• Biological explanations: genetics (COMT & SERT genes) and neural mechanisms (serotonin & dopamine)

• Cognitive explanations: irrational beliefs, faulty thinking

• Biological treatments: SSRIs and drug therapy

• AO1, AO2 and AO3 integrated throughout

• Real-world examples and exam-style tips

Whether you’re preparing for your AQA Paper 1, 2 or 3, or just want to understand OCD clearly, this video has you covered.

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Disclaimer: Important Information

This course is designed for educational purposes only and aims to provide students with a psychological understanding of psychopathology, including conditions such as depression, anxiety disorders, and phobias.

It is not a substitute for professional medical advice, diagnosis, or treatment.

If you are experiencing symptoms of depression, anxiety, or emotional distress — or if you are worried about someone else — it is important to seek help from a qualified mental health professional or support service immediately. This course does not provide therapy, counselling, or crisis support, and the course creators or educators cannot be held responsible for any personal mental health concerns that arise.

If you are in the UK and need urgent support, please contact:

• Samaritans (24/7 emotional support): Call 116 123 or visit www.samaritans.org

• NHS 111: Call 111 for non-emergency medical advice

• Mind (mental health charity): Call 0300 123 3393 or text 86463, or visit www.mind.org.uk

• SHOUT (24/7 text support): Text SHOUT to 85258

• Your GP: Contact your local doctor for referral to mental health services

• Emergency services: If you or someone else is in immediate danger, call 999

International Help Lines:

• International Suicide Prevention Directory (by Befrienders Worldwide): www.befrienders.org

• Lifeline (USA): 988 or 1-800-273-TALK (8255)

• Kids Help Phone (Canada): 1-800-668-6868

• Lifeline Australia: 13 11 14

• SANE Australia: 1800 18 7263

Please take care of yourself and others, and do not hesitate to reach out for support. Mental health is just as important as physical health, and help is always available.

Module Title: Cognitive Explanations of Depression

Understanding how thought patterns contribute to depressive disorders

This module explores the cognitive approach to understanding depression, focusing on how maladaptive thought processes influence emotional and behavioural symptoms. The cognitive explanation suggests that depression results not solely from biological or environmental factors, but from distorted, irrational, and negative patterns of thinking.

Students will examine the two leading cognitive models of depression:

1. Beck’s Cognitive Theory of Depression

Aaron Beck proposed that individuals with depression have developed negative schemas during childhood, often through rejection, criticism, or loss. These schemas lead to systematic cognitive biases, causing the individual to interpret situations in an overly negative way.

Beck’s model is built around the negative triad, which includes:

• Negative views about the self

• Negative views about the world

• Negative views about the future

This triad perpetuates a cycle of hopelessness and low self-worth, contributing to the maintenance of depressive symptoms.

2. Ellis’s ABC Model

Albert Ellis argued that depression is the result of irrational beliefs, formed through faulty interpretation of life events. His model includes:

• A: Activating Event

• B: Beliefs (rational or irrational)

• C: Consequences (emotional and behavioural outcomes)

Irrational beliefs, such as “I must be perfect” or “Everyone must like me,” lead to self-defeating behaviours and emotional distress.

Critical Evaluation

The module encourages students to assess the strengths of cognitive models—such as their real-world application in Cognitive Behavioural Therapy (CBT)—while also considering limitations, including their focus on the individual’s thought processes at the expense of situational or biological factors.

By the end of this module, learners will be able to explain and evaluate the key cognitive theories of depression and understand how they have shaped modern psychological treatment.

Module Title: Cognitive Behavioural Therapy (CBT)

Applying cognitive and behavioural principles to treat psychological disorders

This module introduces Cognitive Behavioural Therapy (CBT), one of the most widely used and evidence-based psychological treatments for mental health conditions such as depression, anxiety disorders, and OCD. CBT is grounded in the idea that thoughts, feelings, and behaviours are interconnected, and that by changing unhelpful thinking patterns and behaviours, individuals can improve their emotional well-being.

The focus of CBT is on identifying and challenging cognitive distortions—such as irrational beliefs, overgeneralisations, catastrophising, and all-or-nothing thinking—and replacing them with more balanced and realistic alternatives. The therapy also incorporates behavioural techniques, including activity scheduling and exposure, to break cycles of avoidance and negative reinforcement.

This module will cover:

• The structure and process of CBT sessions

• Techniques used to identify and dispute negative automatic thoughts (NATs)

• The role of homework tasks, thought diaries, and behavioural experiments

• The application of CBT to specific disorders, such as depression (based on Beck’s cognitive model) and OCD

• The evidence base for CBT and its effectiveness compared to other treatments

Through detailed examples, case studies, and discussion of real-life application, this module will help learners understand how CBT works in practice. Students will also critically evaluate its strengths and limitations, including its suitability for different individuals and the importance of therapist-client collaboration.

By the end of this module, learners will have a strong grasp of CBT as a therapeutic approach, its theoretical foundations, and its practical application in modern clinical psychology.

Introduction: Beck’s Cognitive Theory of Depression

Aaron Beck’s Cognitive Theory is one of the most influential psychological explanations of depression. Developed in the 1960s, it focuses on how distorted thinking patterns, formed through early experiences, contribute to and maintain depressive symptoms. Beck proposed that people with depression have developed negative cognitive schemas, which lead to persistent and automatic negative thoughts about the self, the world, and the future. These thinking patterns result in a biased interpretation of events, fuelling feelings of worthlessness, hopelessness, and helplessness.

Beck’s theory is foundational in the development of Cognitive Behavioural Therapy (CBT) and remains a key component in modern psychological approaches to treating depression.

Ellis’s ABC Model

Understanding how irrational beliefs influence emotional and behavioural responses

Albert Ellis developed the ABC Model as part of his Rational Emotive Behaviour Therapy (REBT), offering a cognitive explanation for psychological disorders such as depression and anxiety. The model suggests that it is not the activating event itself that causes emotional distress, but rather the beliefs an individual holds about the event. These beliefs lead to specific consequences in terms of emotion and behaviour.

The model is structured as follows:

• A – Activating Event: An external event or situation that triggers a response (e.g., failing an exam, rejection, or criticism).

• B – Belief: The individual’s interpretation of the event, which may be rational (e.g., “I can try harder next time”) or irrational (e.g., “I’m a complete failure and will never succeed”).

• C – Consequence: The emotional and behavioural response that follows. Irrational beliefs typically result in negative emotions like guilt, anger, or depression, and unhelpful behaviours such as withdrawal or avoidance.

Ellis argued that irrational beliefs, such as musturbatory thinking (e.g., “I must be liked by everyone” or “I must do well at all times”), create unrealistic expectations that inevitably lead to disappointment and psychological distress.

The ABC model forms the basis of REBT, where therapists work with clients to identify, challenge, and replace irrational beliefs with rational alternatives using logical and empirical disputing techniques.

This section explores how Ellis’s model explains the cognitive roots of depression and how it informs effective therapeutic interventions, particularly in changing self-defeating thought patterns that fuel long-term emotional problems.

Video Description:

Need help understanding depression for AQA Psychology? This video breaks it down clearly and concisely — perfect for revision or learning the topic for the first time!

In this lesson from The Psychology Tutoring Academy, we explore everything you need to know about Depression as part of the Psychopathology topic in AQA A-Level Psychology.

In this video, you’ll cover:

• Clinical characteristics of depression (emotional, behavioural, cognitive)

• The cognitive approach to explaining depression

  • Beck’s Negative Triad

  • Ellis’s ABC Model

• AO3 evaluation of both explanations

• The cognitive approach to treating depression

  • CBT (Cognitive Behavioural Therapy)

  • REBT (Rational Emotive Behaviour Therapy)

  • Strengths and limitations of therapy

• Application tips and exam-style examples

This is your complete revision toolkit for tackling depression in your AQA exams!

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The Phobia of Long Words (Hippopotomonstrosesquippedaliophobia)

An ironic fear with serious psychological roots

This unique and engaging module explores Hippopotomonstrosesquippedaliophobia—the fear of long words—and uses it as a creative entry point to examine how phobias develop and are maintained through the principles of learning theory.

While often referenced humorously due to the irony of its name, this phobia can reflect genuine underlying anxiety, particularly in contexts such as reading aloud, public speaking, or academic performance.

Module Title: Classical Conditioning

Understanding how learning occurs through association

This module introduces Classical Conditioning, a fundamental theory of learning first described by Ivan Pavlov in the early 20th century. It explains how behaviours can be acquired through the process of association, where a neutral stimulus becomes capable of eliciting a response after being repeatedly paired with a stimulus that naturally triggers that response.

Classical Conditioning is a key concept within the behaviourist approach in psychology, which focuses on observable and measurable behaviours rather than internal mental processes. It has important implications for understanding human and animal behaviour, as well as applications in areas such as phobia treatment, advertising, and education.

In this module, students will explore:

• The key components of classical conditioning:

  • Unconditioned stimulus (UCS)

  • Unconditioned response (UCR)

  • Neutral stimulus (NS)

  • Conditioned stimulus (CS)

  • Conditioned response (CR)

• Pavlov’s experiment with dogs, demonstrated how a previously neutral stimulus (a bell) could trigger salivation after being paired with food.

• Core processes such as acquisition, extinction, spontaneous recovery, generalisation, and discrimination.

• Real-life examples, such as how phobias may develop through classical conditioning, and how this understanding informs therapies like systematic desensitisation.

The module will also evaluate the theory’s strengths, such as its scientific credibility and practical applications, as well as its limitations, including its emphasis on stimulus-response learning and neglect of cognitive factors.

By the end of this module, learners will have a clear understanding of how classical conditioning works, how it has been demonstrated through research, and how it applies to everyday learning and behaviour change.

Module Title: Operant Conditioning

Understanding how consequences shape voluntary behaviour

This module introduces Operant Conditioning, a foundational theory of learning proposed by B.F. Skinner. Unlike classical conditioning, which explains learning through associations between stimuli, operant conditioning focuses on how voluntary behaviours are influenced by their consequences.

Operant conditioning suggests that behaviour is learned and maintained through a system of reinforcements and punishments. These consequences increase or decrease the likelihood of a behaviour being repeated. The theory is central to the behaviourist approach, which focuses on observable actions and the environmental factors that shape them.

In this module, students will explore:

• The key components of operant conditioning:

  • Positive reinforcement (adding something pleasant to increase behaviour)

  • Negative reinforcement (removing something unpleasant to increase behaviour)

  • Positive punishment (adding something unpleasant to decrease behaviour)

  • Negative punishment (removing something pleasant to decrease behaviour)

• The work of B.F. Skinner, including his experiments with rats and pigeons using the Skinner Box.

• The use of concepts like shaping, schedules of reinforcement, and extinction.

• Real-world applications of operant conditioning include:

  • Behaviour modification in education

  • Parenting strategies

  • Token economy systems in therapy and institutional settings

The module also critically evaluates the strengths and limitations of operant conditioning as an explanation of behaviour, considering its scientific basis and practical relevance, as well as its limitations in explaining complex human learning and internal cognitive processes.

By the end of this module, learners will have a strong understanding of how behaviour can be learned through consequences and how operant conditioning continues to influence psychology, education, and behaviour management strategies today.

Module Title: Systematic Desensitisation (SD)

A behavioural approach to treating phobias through relaxation and gradual exposure

This module introduces Systematic Desensitisation (SD)—a widely used behavioural therapy designed to reduce phobic anxiety by replacing the fear response with a relaxation response. Based on principles of classical conditioning, SD was originally developed by Joseph Wolpe (1958) and remains a key treatment for specific phobias and other anxiety-related conditions.

Systematic Desensitisation is grounded in the concept of counterconditioning, where the individual learns to associate the phobic stimulus (e.g. a spider, height, or situation) with relaxation instead of fear. The process involves a structured approach, making it especially suitable for learners new to behavioural therapy techniques.

Students will learn about the three main components of SD:

1. Anxiety hierarchy – Developing a ranked list of fear-inducing situations from least to most frightening.

2. Relaxation training – Learning techniques such as deep breathing, progressive muscle relaxation, or mindfulness.

3. Gradual exposure – Facing each item on the hierarchy while in a deeply relaxed state, moving up the ladder only when the previous step is comfortably managed.

This module also examines:

• The theoretical foundations of SD include classical conditioning and the concept of reciprocal inhibition.

• The effectiveness of SD, particularly evident for treating specific phobias (e.g. animal phobias, flying, injections).

• Research support, including studies by Gilroy et al. (2003) and McGrath et al. (1990), demonstrates SD’s long-term success.

• Comparisons with flooding and cognitive therapies, evaluating SD’s advantages, such as being more ethical, gradual, and acceptable to clients.

By the end of this module, students will understand how SD works, its psychological underpinnings, and its value as a practical and evidence-based approach to managing anxiety and phobias.

Flooding

A behavioural therapy that tackles phobias through immediate exposure

Flooding is a behavioural therapy used to treat phobias and anxiety disorders. It is based on the principles of classical conditioning and is designed to help individuals confront their greatest fear directly and without gradual build-up.

Unlike systematic desensitisation, which involves gradual exposure and relaxation training, flooding involves immediate and intense exposure to the phobic stimulus. The client is placed in a situation where they cannot avoid or escape the feared object or situation until their anxiety naturally decreases. This process relies on the principle of extinction: over time, without reinforcement (i.e. no harm occurring), the conditioned fear response fades.

Flooding works because the body’s fear response cannot be sustained indefinitely. After a period of high anxiety, the individual will begin to calm down—at which point they start to associate the feared stimulus with the absence of fear.

Key features:

• No gradual exposure – therapy starts with the most feared scenario.

• Sessions last longer (up to 2–3 hours) to allow time for anxiety to reduce.

• No relaxation techniques are used during the session.

• Often delivered in vivo (real-life exposure), but can also be done in vitro (imagined).

While highly effective for some, flooding is not suitable for everyone. It can be a very distressing experience, and individuals must give fully informed consent. It is generally used for specific phobias, such as fear of flying or enclosed spaces, and not recommended for people with health conditions (e.g. heart issues).

This section examines the theory behind flooding, its applications, ethical considerations, and comparisons with other treatments such as systematic desensitisation and CBT.

Confused about Phobias in AQA Psychology? Don’t worry—this video makes it simple!

In this clear and engaging lesson from The Psychology Tutoring Academy, we break down everything you need about phobias for your AQA A-Level Psychology exams.

In this video, you'll learn:

• What phobias are (clinical characteristics and DSM diagnosis)

• The behavioural approach to explaining phobias

  • Classical and operant conditioning (including Little Albert)

• The two-process model (Mowrer, 1960)

• Evaluation of behavioural explanations (AO3)

• Behavioural treatments:

  • Systematic Desensitisation

  • Flooding

  • Effectiveness and ethical issues

• Real-world examples and exam-style application tips

Whether you're revising for your Paper 1 exam or just want to understand phobias more deeply, this video will help you study smarter, not harder.

Need more help with Psychology?
Check out the full Udemy course:
https://www.udemy.com/user/stephen-renwick-11

For free resources, tutoring, and full revision packs, visit:
www.psychologytutoring.academy

Tags / Hashtags:

#Phobias #AQAPsychology #BehaviouralApproach #SystematicDesensitisation #Flooding #Psychopathology #ALevelPsychology #PsychologyRevision #ThePsychologyTutoringAcademy #LittleAlbert #MentalHealthAwareness

DSM-IV in Psychology

The Diagnostic and Statistical Manual of Mental Disorders – Fourth Edition

The DSM-IV (Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition) was published by the American Psychiatric Association (APA) in 1994 and served as the leading classification system for mental health disorders for nearly two decades, until it was replaced by the DSM-5 in 2013.

The DSM-IV provided standardised criteria and definitions for the diagnosis of mental disorders, allowing psychologists, psychiatrists, and other clinicians to use a common language when identifying and treating psychological conditions. It lists approximately 297 mental disorders, each defined by a specific set of observable symptoms, duration criteria, and exclusion rules.

One of the key features of the DSM-IV was its multiaxial system, which encouraged clinicians to consider different aspects of a person’s mental health:

1. Axis I – Clinical disorders (e.g., depression, anxiety disorders, schizophrenia)

2. Axis II – Personality disorders and intellectual disability

3. Axis III – General medical conditions that may affect mental health

4. Axis IV – Psychosocial and environmental stressors

5. Axis V – Global Assessment of Functioning (GAF): a score from 0–100 measuring overall psychological, social, and occupational functioning

The DSM-IV was grounded in descriptive diagnosis, focusing on symptom patterns rather than underlying causes. Although it improved diagnostic reliability and facilitated research, it also attracted criticism for its cultural bias, over-medicalisation, and potential for diagnostic overlap.

Overall, the DSM-IV played a crucial role in shaping modern psychiatry and clinical psychology, influencing both diagnosis and treatment planning during its time in use.

Module Title: ICD-10 – The International Classification of Diseases (10th Revision)

A global framework for diagnosing mental and physical disorders

This module introduces students to the ICD-10 (International Classification of Diseases, Tenth Revision), a comprehensive diagnostic tool published by the World Health Organisation (WHO). The ICD is used globally by clinicians and health systems to classify all diseases and health conditions, including mental and behavioural disorders.

The ICD-10 provides a standardised, internationally recognised framework for diagnosing psychological disorders, and it plays a critical role in clinical practice, health research, epidemiology, and public health policy. Unlike the DSM, which is predominantly used in the United States, the ICD is the official diagnostic system in the UK and across much of the world.

This module will explore:

• The structure and coding system of the ICD-10 includes how disorders are classified under specific codes (e.g. F32 for depressive episodes, F20 for schizophrenia).

• The Mental and Behavioural Disorders chapter (Chapter V) covers disorders such as schizophrenia, mood disorders, anxiety, OCD, and personality disorders.

• How the ICD-10 is used in clinical settings to aid diagnosis and treatment planning.

• Comparison with the DSM, including differences in approach, international use, and cultural sensitivity.

The module will also examine strengths and criticisms of the ICD-10, such as its global applicability, accessibility in over 40 languages, and public health focus, alongside concerns about reliability and diagnostic overlap.

By the end of the module, students will understand how the ICD-10 contributes to consistent mental health diagnosis worldwide and how it supports international data collection, health care planning, and service delivery.