Welcome to the Study of Schizophrenia!
Welcome! Today we are diving into one of the most fascinating and often misunderstood topics in Psychology: Schizophrenia. While movies often portray it inaccurately, we are going to look at the real science behind it. We will explore how doctors diagnose it, why it happens (is it our genes or our environment?), and how it can be treated.
Don't worry if some of the terms seem big at first—we will break them down into bite-sized pieces together. You’ve got this!
1. What is Schizophrenia? (Classification and Symptoms)
Schizophrenia is a psychotic disorder, which means it involves a loss of contact with reality. To keep things simple, psychologists divide the symptoms into two groups: Positive and Negative.
Positive Symptoms (Added Behaviors)
Think of "positive" like a plus sign \(+\). These are extra experiences that "normal" people don't have.
- Hallucinations: Unusual sensory experiences. These can be auditory (hearing voices) or visual (seeing things that aren't there).
- Delusions: Beliefs that have no basis in reality. For example, a "delusion of grandeur" is believing you are a famous person or a king. A "delusion of persecution" is believing the government is spying on you.
Negative Symptoms (Taken-away Behaviors)
Think of "negative" like a minus sign \(-\). These are things that are missing from a person's "normal" way of functioning.
- Speech Poverty (Alogia): A reduction in the amount or quality of speech. The person might give very short, one-word answers.
- Avolition: A total lack of motivation. It’s not just "being lazy"; it’s finding it impossible to start or finish even simple tasks like getting dressed.
Quick Review: Positive = Extra stuff (Hallucinations/Delusions). Negative = Missing stuff (Speech poverty/Avolition).
Key Takeaway
Diagnosis requires a combination of these symptoms over a period of time, usually using systems like the DSM-5 or ICD-11.
2. Issues in Diagnosis: Is it Accurate?
Psychologists argue about how reliable and valid the diagnosis of schizophrenia actually is. Reliability means consistency (do different doctors agree?). Validity means accuracy (is it actually schizophrenia?).
Common Problems to Watch Out For:
- Co-morbidity: This is when two or more conditions happen at the same time. If a patient has schizophrenia and depression, it’s hard to tell which symptom belongs to which disorder.
- Symptom Overlap: Schizophrenia shares symptoms with other disorders (like Bipolar). This makes it hard to give a unique diagnosis.
- Gender Bias: Research suggests men are diagnosed more often than women. This might be because women have better coping mechanisms, leading doctors to under-diagnose them.
- Culture Bias: In some cultures, "hearing voices" is seen as a spiritual gift rather than a symptom of illness. Western doctors might misdiagnose cultural differences as mental illness.
Memory Aid: Use the mnemonic "C-G-S-C" to remember the issues: Culture, Gender, Symptom overlap, Co-morbidity.
Key Takeaway
Diagnosis isn't perfect. Factors like gender and culture can change how a doctor views a patient's symptoms.
3. Biological Explanations: Is it in our DNA?
The biological approach suggests that schizophrenia is caused by something "broken" in the body.
Genetics
Schizophrenia runs in families. Gottesman (1991) found that if your identical twin has schizophrenia, you have a 48% chance of getting it too. Because identical twins share 100% of their DNA, this strongly suggests a genetic link.
The Dopamine Hypothesis
Dopamine is a chemical messenger (neurotransmitter) in the brain.
- Hyperdopaminergia: Too much dopamine in certain areas (like the subcortex) is linked to positive symptoms like hallucinations.
- Hypodopaminergia: Too little dopamine in the prefrontal cortex is linked to negative symptoms.
Neural Correlates
This is the idea that specific brain structures are linked to specific symptoms. For example, enlarged ventricles (fluid-filled gaps in the brain) are often found in people with schizophrenia, meaning they have less brain tissue.
Did you know? Even though the genetic link is strong (48%), it’s not 100%. This means the environment must play a role too!
Key Takeaway
Biology focuses on three things: Genetics, Dopamine levels, and Brain structure.
4. Psychological Explanations: Is it the Environment?
Some psychologists look at how family life and thinking patterns contribute to the disorder.
Family Dysfunction
- The Schizophrenogenic Mother: An old (and controversial) theory describing a cold, rejecting, and controlling mother who creates a climate of secrecy, leading to distrust and paranoid delusions.
- Double-Bind Theory: When a child receives conflicting messages. For example, a parent says "I love you" but pulls away in disgust. This leaves the child confused about reality.
- Expressed Emotion (EE): High levels of criticism, hostility, or over-involvement in a family. High EE is a major cause of relapse (the symptoms coming back).
Cognitive Explanations
This focuses on dysfunctional thought processing.
1. Metarepresentation: This is our ability to reflect on our own thoughts. If this fails, a person might think their own internal "voice" is actually an outside voice (hallucination).
2. Central Control: This is the ability to suppress automatic responses. If this fails, the person cannot stop themselves from speaking every thought that comes to mind (speech poverty/disorganization).
Key Takeaway
Psychological theories blame stressful family environments or "glitches" in how we process information.
5. Drug Therapy: Typical vs. Atypical
Drug therapy is the most common treatment. These drugs are called Antipsychotics.
Typical Antipsychotics (e.g., Chlorpromazine)
- Used since the 1950s.
- They work by blocking dopamine receptors.
- Mostly help with positive symptoms.
- Side effects: Can be severe, like "Tardive Dyskinesia" (uncontrollable facial tics).
Atypical Antipsychotics (e.g., Clozapine)
- Developed more recently.
- They block dopamine and serotonin receptors.
- Help with both positive and negative symptoms.
- Lower risk of physical side effects but can cause blood problems.
Quick Review Box: Typical = Old, Dopamine only, Positive symptoms. Atypical = New, Dopamine + Serotonin, Positive + Negative symptoms.
6. Psychological Therapies
Drugs aren't the only way to help! We can also "talk" through the issues or manage behaviors.
- Cognitive Behavioural Therapy (CBT): Helps patients identify and challenge their irrational thoughts. If a patient hears a voice saying "the devil is coming," the therapist helps them find a logical explanation.
- Family Therapy: Works with the whole family to reduce stress and Expressed Emotion. The goal is to make the home a calmer place.
- Token Economies: A behavioral technique used in hospitals. Patients get "tokens" (like fake money) for good behavior (e.g., making their bed). They can swap these for rewards (e.g., sweets). This treats avolition.
Key Takeaway
Psychological therapies help patients manage their symptoms and live more independent lives.
7. The Interactionist Approach: The Big Picture
This is currently the most popular view. It says that schizophrenia isn't just nature or just nurture—it's both! We use the Diathesis-Stress Model to explain this.
How it works:
1. Diathesis (Vulnerability): You are born with a genetic risk or have early brain trauma.
2. Stress (Trigger): A stressful life event (like family conflict or drug use) triggers that vulnerability.
Treatment:
Because the cause is a mix of bio and psycho factors, the treatment should be too! Research shows that combining Antipsychotic drugs with CBT is more effective than either one alone.
Key Takeaway
Schizophrenia is caused by a mix of biological "vulnerability" and environmental "stress." The best treatment is a combination of drugs and therapy.
Well done! You have finished the notes on Schizophrenia. Take a break, grab a glass of water, and try a few practice questions to see what you remember!