Psychological problems Revision Notes

What is Social Drift?

The social drift hypothesis suggests that individuals with schizophrenia tend to move down the socioeconomic ladder (social drift or downward drift) because of the debilitating effects of their illness. It's not that being poor causes schizophrenia, but rather that having schizophrenia makes it difficult to maintain a good job, education, or social status. This leads to a higher prevalence of schizophrenia in lower social classes, but as a consequence of the illness itself, not its cause.

Mechanism of Social Drift

The symptoms of schizophrenia, such as cognitive impairments, negative symptoms (e.g., apathy, social withdrawal), and positive symptoms (e.g., hallucinations, delusions), can significantly hinder an individual's ability to work consistently, maintain relationships, and manage daily responsibilities. These challenges often lead to unemployment, reduced income, loss of housing, and ultimately, a decline in social class. For example, a person developing schizophrenia during young adulthood might struggle to complete higher education or hold down a demanding job, even if they come from an affluent background, leading to a downward movement in their social standing.

Distinction from Social Causation

It is crucial to distinguish social drift from the 'social causation' hypothesis. Social causation proposes that factors associated with lower social class, such as stress, poor nutrition, or limited access to healthcare, are risk factors for developing schizophrenia. In contrast, social drift argues the reverse: the illness itself leads to a decline in social status. Research evidence often supports the idea that illness precedes the social decline, bolstering the social drift explanation. This distinction has important implications for both understanding the disorder and developing effective interventions.

Characteristics of Schizophrenia

Schizophrenia is a serious mental illness characterised by a range of symptoms impacting thoughts, feelings, and behaviours. Symptoms are commonly categorised as 'positive' and 'negative'. Positive symptoms involve an excess or distortion of normal functions. This includes hallucinations, which are sensory experiences not based in reality (e.g., hearing voices). Delusions are fixed, false beliefs resistant to logical reasoning (e.g., believing one is being persecuted or is a deity). Disorganised thought and speech, where ideas jump from one topic to another or are illogical, also fall under positive symptoms. Negative symptoms involve a reduction or absence of normal functions. Examples include avolition, a severe lack of motivation or drive to complete tasks or engage in activities. Alogia refers to a reduction in the quantity and fluidity of speech. Anhedonia is the inability to experience pleasure from activities previously enjoyed. Affective flattening describes a reduced range and intensity of emotional expression.

Biological Explanations: Genetics

The genetic explanation for schizophrenia suggests that a predisposition to the disorder can be inherited. This is supported by family studies showing higher rates of schizophrenia among biological relatives of those with the condition compared to the general population. Twin studies provide stronger evidence; monozygotic (identical) twins, who share nearly 100% of their genes, show significantly higher concordance rates (both twins having the disorder) than dizygotic (non-identical) twins, who share about 50% of their genes. For example, if one identical twin has schizophrenia, the likelihood of the other twin also developing it is considerably higher than for a non-identical twin pair. Adoption studies compare genetically related individuals raised apart, further separating genetic and environmental influences. These studies consistently show increased risk in adopted children whose biological parents had schizophrenia, even if their adoptive parents did not. This indicates a genetic vulnerability, though it's not a sole determinant, implying environmental factors interact with genetic predispositions.

Biological Explanations: The Dopamine Hypothesis

The dopamine hypothesis posits that schizophrenia is linked to an imbalance in dopamine activity within the brain. The original hypothesis suggested that an excess of dopamine, particularly in subcortical areas like the mesolimbic pathway, was primarily responsible for positive symptoms such as hallucinations and delusions. This was supported by observations that drugs increasing dopamine activity (e.g., amphetamines) can induce psychotic symptoms, and antipsychotic medications that block dopamine receptors (dopamine antagonists) effectively reduce positive symptoms. A revised dopamine hypothesis acknowledges the complexity, suggesting that not just excess, but also too little dopamine, specifically in certain cortical areas (e.g., the mesocortical pathway) of the prefrontal cortex, may contribute to the negative symptoms of schizophrenia, such as avolition and alogia. This dual role of dopamine highlights that an imbalance, rather than simply an excess, is believed to underlie the diverse symptomatology of schizophrenia.

Mental Health Definitions

Mental health encompasses emotional, psychological, and social well-being, influencing thought, feeling, and behaviour. It's not merely the absence of mental illness, but rather a state of well-being where an individual can cope with life's stresses, work productively, and contribute to their community. Mental illness refers to specific health conditions that significantly affect thinking, emotion, or behaviour, leading to distress or functional impairment. Good mental health allows for resilience and positive functioning, while mental illness can disrupt daily life.

Prevalence of Mental Health Conditions

Prevalence measures how common a condition is in a population, either at a specific time (point prevalence) or over a period (period prevalence). Mental health issues are highly prevalent; statistics often indicate that a significant proportion of the population will experience mental health problems. For example, conditions such as anxiety and depression are common globally. These high prevalence rates underscore the importance of understanding and addressing mental health at a societal level, acknowledging that many individuals are affected.

Stigma in Mental Health

Stigma involves negative attitudes, beliefs, and stereotypes towards individuals with mental health conditions. It manifests in public stigma (societal discrimination and prejudice) and self-stigma (internalised negative beliefs leading to shame). Stigma can cause individuals to be labelled, stereotyped, and discriminated against. This often results in a reluctance to seek help, fear of judgment, social exclusion, and poorer outcomes for those experiencing mental health challenges. Reducing stigma is crucial for improving support access and treatment engagement.

Social Effects of Mental Health Conditions and Stigma

The social effects of mental health conditions and the accompanying stigma are profound. Individuals may experience social isolation, difficulty maintaining relationships, employment discrimination leading to unemployment or underemployment, and housing challenges. Stigma can lead to fear of speaking out, delay in seeking treatment, and reduced quality of life. Societally, it can perpetuate cycles of disadvantage and hinder efforts to integrate individuals effectively. Addressing mental health often requires tackling these broader social impacts.

Aim and Methodology

The aim of Daniel, Weinberger, Jones and colleagues (1991) was to investigate the relationship between cerebral blood flow in the prefrontal cortex and neuropsychological deficits in individuals with schizophrenia. They hypothesised that schizophrenic patients would show reduced blood flow (hypofrontality) in this brain region during cognitive tasks requiring executive function, especially compared to healthy controls. The methodology involved using Positron Emission Tomography (PET) scans, a neuroimaging technique, to measure regional cerebral blood flow (rCBF). Participants, comprising patients with schizophrenia and a control group, completed cognitive tasks such as the Wisconsin Card Sorting Test (WCST), known for engaging the prefrontal cortex, and simpler comparison tasks. This allowed for objective measurement of brain activity during specific cognitive demands.

Key Findings and Conclusion

The key finding was that patients with schizophrenia, particularly those with prominent negative symptoms, exhibited significantly lower cerebral blood flow in the prefrontal cortex while performing the Wisconsin Card Sorting Test compared to the healthy control group. This reduced activation, termed 'hypofrontality', was directly associated with poorer performance on the cognitive task. The study concluded that impaired prefrontal cortical function underlies some of the cognitive deficits observed in schizophrenia, providing substantial support for the 'hypofrontality hypothesis'. This indicated a biological basis for cognitive symptoms and enhanced understanding of the neurobiology of the disorder.

Evaluation: Strengths

A significant strength of the study was its use of objective neuroimaging techniques (PET scans), which provide quantifiable measures of brain activity, enhancing the scientific rigour and reliability of the findings. The experimental design included a control group, allowing for direct comparison and helping to isolate the effects related to schizophrenia. The tasks used were carefully chosen to specifically target prefrontal cortex functions, providing a focused investigation. These aspects contributed to the study's impact on understanding the biological underpinnings of schizophrenia.

Evaluation: Limitations

Despite its strengths, the study had limitations. A primary limitation is the correlational nature of the findings; while it showed an association between hypofrontality and cognitive deficits, it did not definitively establish causation. It's difficult to conclude if reduced blood flow causes symptoms or is a consequence of other factors. The sample size was relatively small, which could limit the generalisability of the results to a broader population of individuals with schizophrenia. Furthermore, the laboratory tasks, while controlled, might not fully capture the complexity of real-world cognitive impairments experienced by individuals with schizophrenia, raising questions about ecological validity. Finally, ethical considerations, such as the use of radioactive tracers in PET scans, are always present.