Welcome to the Study of Schizophrenia!

Hello there! Today we are diving into one of the most fascinating and, unfortunately, most misunderstood topics in Psychology: Schizophrenia. While movies often portray it incorrectly as "split personality," we are going to learn what it really is: a serious mental disorder that affects how a person thinks, feels, and perceives the world. Don't worry if it seems complex; we'll break it down piece by piece!

1. What is Schizophrenia? (Classification and Symptoms)

Before we can treat Schizophrenia, we have to know what it looks like. Doctors use two main manuals to diagnose it: the DSM-5 (used mostly in the USA) and the ICD-11 (used in the UK and Europe).

Positive vs. Negative Symptoms

Psychologists divide the symptoms into two groups. Think of it like a math equation: Positive means something is added to your experience, and Negative means something is taken away.

Positive Symptoms (The "Added" Experiences):

  • Hallucinations: Sensing things that aren't there. This is most commonly hearing voices, but it can also be seeing, smelling, or feeling things.
  • Delusions: Beliefs that aren't true but the person is 100% sure of them. For example, a delusion of grandeur (believing you are a famous king) or a delusion of persecution (believing the secret service is following you).

Negative Symptoms (The "Loss" of Normal Function):

  • Avolition: A total lack of motivation. The person might find it impossible to get out of bed or perform basic tasks like showering.
  • Speech Poverty (Alogia): A reduction in the amount and quality of speech. The person might give very short, one-word answers or stop talking altogether.

Memory Aid: Use the "Two A's" for negative symptoms: Avolition (lack of action) and Alogia (lack of words).

Quick Review: The Difference

Common Mistake: Many students think "Positive" means "Good." In Psychology, it just means "Presence." A hallucination is a "Positive" symptom because it is a presence of a sensation that shouldn't be there.

Key Takeaway: Schizophrenia is a "spectrum" disorder defined by the presence of hallucinations/delusions and the loss of motivation/speech.

2. Biological Explanations

Why does Schizophrenia happen? Biopsychologists look at our "hardware"—our genes and brain chemistry.

Genetics

Schizophrenia runs in families. Researchers like Gottesman have shown that the more DNA you share with someone who has Schizophrenia, the higher your risk.

  • Identical Twins (MZ): share \( 100\% \) DNA. Risk of both having it: \( 48\% \).
  • Fraternal Twins (DZ): share \( 50\% \) DNA. Risk: \( 17\% \).
  • General Population: Risk: \( 1\% \).

The Dopamine Hypothesis

Dopamine is a chemical messenger (neurotransmitter) in the brain. The original theory was simple: Too much dopamine = Schizophrenia.

  • Hyperdopaminergia: High levels of dopamine in the subcortex (middle of the brain). This is linked to hallucinations.
  • Hypodopaminergia: More recent research suggests low levels of dopamine in the prefrontal cortex (the thinking part of the brain) might cause negative symptoms like avolition.

Neural Correlates

This is just a fancy way of saying "brain structures that match the symptoms." For example, people with Schizophrenia often have enlarged ventricles (fluid-filled gaps in the brain), which means they have less actual brain tissue.

Key Takeaway: It’s not just "in the mind"—there are physical differences in the genes, chemicals, and brain structures of people with Schizophrenia.

3. Psychological Explanations

If biology is the "hardware," psychological explanations look at the "software"—how we think and how our environment affects us.

Family Dysfunction

This theory suggests that stress at home can trigger the disorder.
1. The Double-Bind Theory: When a child gets "mixed signals." For example, a parent says "I love you" but turns away in disgust. This leaves the child confused and suspicious.
2. Expressed Emotion (EE): High levels of criticism, hostility, and "emotional over-involvement" from parents. High EE is a major reason why people relapse (get sick again) after leaving the hospital.

Cognitive Explanations

Christopher Frith suggested that Schizophrenia is caused by "broken" thinking processes:

  • Metarepresentation dysfunction: This is our ability to recognize our own thoughts as our own. If this "breaks," you might hear your own internal voice but think it's an "outside voice" (a hallucination).
  • Central Control dysfunction: Our ability to suppress automatic responses. This explains "word salad" or disorganized speech—the person can't stop irrelevant thoughts from coming out of their mouth.

Key Takeaway: Family stress and faulty "thought-checking" mechanisms in the brain contribute to the development of symptoms.

4. Biological Treatments (Drug Therapy)

Since the 1950s, Antipsychotic drugs have been the main treatment. They usually come in two "flavours":

Typical Antipsychotics (The Old Ones)

Example: Chlorpromazine.
How they work: They block dopamine receptors in the brain to "calm down" the system.
Side effects: Can be severe, like "Tardive Dyskinesia" (involuntary face twitching).

Atypical Antipsychotics (The New Ones)

Example: Clozapine.
How they work: They block dopamine but also act on Serotonin. They are better at treating negative symptoms (like mood) and have fewer movement-related side effects.

Did you know? Clozapine is so effective that it is often used when no other drugs work, but patients need regular blood tests because it can occasionally cause a dangerous drop in white blood cells.

Key Takeaway: Drugs are very effective at reducing positive symptoms (hallucinations), but they aren't a "cure" and can have tough side effects.

5. Psychological Treatments

Cognitive Behavioural Therapy (CBTp)

The goal isn't to "cure" the person but to help them cope. A therapist helps the patient challenge their delusions.
Example: If a patient thinks the FBI is listening through the radio, the therapist might ask, "How likely is it that the FBI has the time to listen to everyone's radio?" This is called reality testing.

Family Therapy

This aims to reduce the "Expressed Emotion" (EE) we talked about earlier. It teaches families how to be supportive rather than critical, which lowers the patient's stress levels.

Token Economies

This is a behaviorist approach used in hospitals. Patients get "tokens" (like fake money) for good behavior (e.g., making their bed). They can swap these tokens for rewards (e.g., sweets or extra phone time). It helps manage symptoms while in a ward.

Key Takeaway: Psychological therapies help patients manage their lives and reduce the chance of the illness coming back.

6. The Interactionist Approach

Don't worry if you can't decide if Schizophrenia is biological or psychological—most modern psychologists think it's both! This is called the Diathesis-Stress Model.

  • Diathesis: This is your "vulnerability" (usually your genes).
  • Stress: This is the "trigger" from your environment (like drug use or family stress).

The Analogy: Imagine two glass cups. One is half-full (high genetic risk), and one is nearly empty (low genetic risk). If you pour "stress" (water) into both, the half-full cup will overflow much sooner. You need both the genetic risk and the environmental stress for the disorder to develop.

Quick Review Box:

Classification: Positive (added) vs Negative (taken away) symptoms.
Biological: Genes, high Dopamine, brain structure.
Psychological: Family stress, faulty thinking (Metarepresentation).
Treatments: Drugs (block dopamine) and CBT (challenge thoughts).
Interactionist: Diathesis (Biology) + Stress (Environment) = Schizophrenia.

Keep going! You're doing a great job mastering this complex topic. Just remember to take it one concept at a time!