What is schizophrenia?

Schizophrenia is a serious mental health disorder classified as a psychotic disorder, meaning it involves a loss of contact with reality. The International Classification of Diseases (ICD-11), produced by the World Health Organization, provides the standard guidelines for diagnosing schizophrenia. According to ICD-11, a diagnosis requires at least two symptoms to be present for a minimum of one month, with at least one symptom from the first four categories of positive symptoms.

Positive symptoms of schizophrenia

Positive symptoms refer to the presence of abnormal experiences or behaviours that are not typically seen in people without the disorder.

Key positive symptoms

• Hallucinations - Involuntary sensory experiences that occur without any external stimuli. For example, auditory hallucinations might involve hearing voices.
• Experiences of influence, passivity, or control - The subjective feeling that one's thoughts, emotions, or actions are being manipulated by outside forces. This could include thought insertion, where a person believes external entities are planting ideas directly into their mind.
• Delusions - Strongly held false beliefs that contradict reality and are not swayed by evidence. Common types include delusions of persecution, where someone believes they are being monitored by the police, and delusions of grandeur, where a person thinks they have special powers.
• Disorganised thinking, speech, and movements - A disruption in logical thought processes, resulting in speech that is hard to follow and behaviours that seem erratic. For instance, derailment occurs when a person's train of thought suddenly shifts to unrelated topics.

Negative symptoms of schizophrenia

Negative symptoms involve the absence or reduction of normal emotional responses, motivations, or social behaviours.

Key negative symptoms

• Affective flattening - A reduced range of emotional expression, where a person shows little reaction to events that would normally evoke feelings. For example, when discussing a family member's death, the individual might report the facts without expressing sadness or grief.
• Avolition - A lack of motivation or ability to initiate and complete goal-directed activities. This can result in difficulties with routine tasks, such as preparing a meal.
• Asociality - Social withdrawal, where the person avoids interactions and isolates themselves from others. This might mean skipping social events.

Research study: Aneja et al. (2018) on early-onset schizophrenia

This study explored schizophrenia in a young individual, highlighting how the disorder can present differently in children and the challenges in treatment.

Aim

• To investigate the clinical features of very early-onset schizophrenia and identify effective treatment approaches.

Participants

• A 14-year-old boy from Northern India, living with his grandparents, who did not attend school and had a history of aggressive outbursts and hospital admissions.

Method and procedure

• The researchers conducted a six-month analysis using a combination of primary data (direct observations and self-reports from the boy) and secondary data (IQ tests and medical records).
• The boy was monitored for symptoms and treated with various interventions.

Results

• Positive symptoms - Included shouting or muttering at unseen people, with voices that teased him.
• Negative symptoms - Featured asociality and struggles with self-care tasks.
• Treatment involved multiple medications, electroconvulsive therapy, psychoeducation for the family, and dietary advice.

Conclusions

• Schizophrenia is uncommon in children, and finding the right mix of treatments can be challenging when it does occur.

Evaluation

• Strengths - Provides detailed insights into the boy's home and potential school life, offering valid real-world applications like combining atypical antipsychotics.
• Limitations - Based on a single case in a specific cultural context, limiting generalisability; reliance on potentially unreliable secondary data, such as unverified IQ scores.

Key study: Freeman et al. (2003) on paranoia and virtual reality

This research investigated how everyday situations might trigger paranoid thoughts, using virtual reality to simulate social environments.

Context and aims

• Building on prior work showing avatars can evoke emotions, the study aimed to explore how neutral avatars might provoke persecutory thoughts in non-clinical populations.
• The hypothesis was that higher levels of pre-existing paranoia and emotional distress would increase the likelihood of such thoughts.

Method and design

• A correlational study using questionnaires for self-reported data and semi-structured interviews.
• Co-variables included trait measures (stable characteristics like mood, anxiety, and paranoia) and state measures (temporary responses like persecutory ideation after the virtual reality experience).

Participants

• A volunteer sample of 24 mentally healthy adults from London, UK (21 university students and 3 administrative staff, with a mean age of 26).

Procedure

• Participants first completed questionnaires assessing mood, anxiety, and paranoia.
• They then spent five minutes in a virtual reality library with neutral avatars, instructed to form impressions of them.
• Afterwards, they repeated the questionnaires, including a new measure of situation-specific paranoia, and underwent filmed interviews rated by a clinical psychologist for persecutory ideation levels.

Controlled variables

• All participants experienced the same virtual reality setup, with avatars behaving identically and the same exposure time.

Ethics

• Consent was obtained, but details about studying persecutory thoughts were withheld to avoid influencing responses.
• No increase in anxiety was observed post-experience.

Results

• Mean paranoia scores were low, with most participants viewing avatars positively.
• However, 42% agreed somewhat with negative statements, like "They were talking about me behind my back."
• Persecutory ideation correlated positively with paranoia, interpersonal sensitivity, and anxiety.
• Qualitative data from interviews included positive comments and negative ones.

Conclusions

• Anxiety plays a direct role in forming persecutory thoughts, and virtual reality shows promise for researching, assessing, and treating paranoia in schizophrenia.

Evaluation

• Strengths - Objective scoring of quantitative questionnaire data allowed statistical analysis; the standardised virtual reality procedure enhances replicability.
• Limitations - Low immersion in the virtual environment and short duration may reduce validity; subjective ratings by a single observer could introduce bias.

Evaluating the ICD-11 diagnostic criteria

The ICD-11 criteria aim to provide a reliable framework for diagnosing schizophrenia, but they have both advantages and drawbacks.

Strengths of ICD-11 criteria

• Requires symptoms for only one month, enabling quicker access to treatment.
• Removed unreliable subtypes to improve diagnostic consistency.

Weaknesses of ICD-11 criteria

• Short symptom duration might lead to misdiagnosis, causing unnecessary stigma or marginalisation.
• Overlap with other disorders, like depression which can also cause hallucinations, reduces reliability.

Issues and debates in schizophrenia research

Research on schizophrenia raises important ethical and explanatory considerations.

Individual and situational explanations

Individual explanations focus on personal traits, such as high trait anxiety or paranoia, which may predispose someone to symptoms like persecutory ideation. Situational explanations consider environmental factors, like stressful or ambiguous social settings, that can trigger these thoughts even in non-clinical groups. Studies like Freeman et al. (2003) highlight how both interact.

Use of children in psychological research

When involving children, as in Aneja et al. (2018) with a 14-year-old, parental consent is essential, along with the child's assent. This is particularly crucial for vulnerable children with conditions like schizophrenia, to ensure their well-being and avoid exploitation.