Phenothiazines, for example, that work by blocking dopamine at the synapse, have Biological explanations of schizophrenia effective in alleviating major symptoms of schizophrenia. Dopamine is one of many chemical neurotransmitters which send messages of neuronal synapses. This model says the excess sensitivity to dopamine results in the brain causes the symptoms of schizophrenia.
Genetic Factors Some psychologists say that schizophrenia can be passed down generations, meaning that some people inherit the disorder from their parents. Research into ventricles, which are cavities that store cerebro-spinal fluid in the brain, have also revealed that these are larger in people with schizophrenia than in those without Brown et al, This strongly supports a familial link with the disorder.
Schizophrenics returning to such a family were more likely to relapse into the disorder than those returning to a family low in EE.
Some psychologists believe that the increase in the size of these ventricles is what leads to the schizophrenic symptoms. Culture - One of the biggest controversies in relation to classification and diagnosis is to do with cultural relativism and variations in diagnosis. Evaluation of the Dopamine Hypothesis Autopsies have found an unusually high number of dopamine receptors in the brain of schizophrenics Owen et al,however, this evidence is varied and inconclusive.
It is not a cure. This means that it is sometimes difficult to distinguish between the effects that schizophrenia has had on the brain of schizophrenic patients and the effects of the antipsychotic drugs.
These reinforcers are exchanged for benefits such as a film or a coffee. Despite the fact that abnormalities have been found in neuro-anatomical structures in the brains of schizophrenic patients, findings have been controversial and it has been occasionally difficult to pinpoint exactly how these abnormalities could be causing schizophrenic symptoms.
Issues with the dopamine hypothesis are in abundance in spite of supporting evidence. They found that schizophrenics reported a higher recall of double bind statements by their mothers than non-schizophrenics. Some people who have been diagnosed as schizophrenic appear to have difficulties with this skill.
Twin Studies Twin studies offer another way of establishing genetic links, by comparing the difference in concordance rates i. They assumed the bogus patients were schizophrenic with no real evidence. Carlsson discovered that giving L-Dopa to animals reduced their Parkinsons-like symptoms; L-dopa also reduced Parkinsons symptoms in humans but gave them psychotic symptoms that were similar to schizophrenia.
The dopamine hypothesis states that the positive symptoms of schizophrenia are produced by overactivity of synapses that use dopamine as a transmitter substance.
People with schizophrenia need psychological treatments too like CBT. Because arange of individual differences exist between sufferers in their vulnerability to the development of this serious disorder, arguably, this model could be the most plausible account for the onset and maintenance of such a complex and universal disorder as schizophrenia is.
The genetic explanation is a genuine explanation about the cause of schizophrenia and it is tied in with our understanding of how evolution works. Evaluation of the Dopamine Hypothesis Autopsies have found an unusually high number of dopamine receptors in the brain of schizophrenics Owen et al,however, this evidence is varied and inconclusive.
There are several issues with this kind of research, however. Weinbereger argues that schizophrenia is due to dopamine overactivity in the pathways linking the midbrain to the limbic system, and underactivity linking the midbrain to the cortex.
It is the most common of psychotic disorders that, in most countries around the world, affects around 1 per cent of the population.
This means that sample sizes in these studies are usually very small and so researchers have difficulty generalizing results to the entire population. A main source of evidence for the dopamine hypothesis is that dopamine-reducing antipsychotics reduce positive symptoms in schizophrenics; however they are only effective for around 75 per cent of patients.
Schizophrenia Describe and evaluate biological explanations of schizophrenia 24 marks Schizophrenia is a psychotic disorder characterized by distorted thinking, impaired emotional responses, poor interpersonal skills and a distortion of reality.
The most common delusion that people diagnosed with schizophrenia report is that others are trying to harm or kill them — delusions of persecution.
A main source of evidence for the dopamine hypothesis is that dopamine-reducing antipsychotics reduce positive symptoms in schizophrenics; however they are only effective for around 75 per cent of patients. It only shows that these people have a predisposition an increased risk.
Based on this information, they could avoid stressful occupations or drug use that might trigger the condition. The biological explanation is deterministic if it claims that schizophrenia is inevitable in people with the wrong genes. Haraczin a review of post-mortem studies of schizophrenics, found that many of those who displayed elevated dopamine levels were receiving antipsychotic drugs shortly before death.
For example, poor people are much more at risk from schizophrenia. A weakness of the family relationsships appraoch is that there is a problem of cause and effect.Jun 07, · Discuss biological explanations of schizophrenia (24 marks) The biological approach assumes that schizophrenia has an organic cause, though this doesn’t deny the role of psychological factors in the onset of the disorder.
Whereas psychological explanations tend to focus on cognitive, emotional and environmental factors that may cause the disorder, biological explanations tend to focus on genetic, biochemical and neuro-anatomical factors as the cause of the disorder.
One biological explanation of schizophrenia is ‘the genetic hypothesis’. Explanations of Schizophrenia No single cause has been identified, biological, behavioural and social research suggests a complex interplay between factors. For example, people might have an inherited tendency towards schizophrenia that is triggered by environmental circumstances.
Explanations of Schizophrenia. No single cause has been identified, biological, behavioural and social research suggests a complex interplay between factors. For example, people might have an inherited tendency towards schizophrenia that is triggered by environmental circumstances.
Feb 28, · Biological Explanations for Schizophrenia - for AQA spec Alevel Psychology, paper 3 - Duration: Psych Boost 3, views. Schizophrenia Revision Notes.
by Bruce Johnson, published WHAT YOU NEED TO KNOW Diagnosis and Classification of Schizophrenia. Biological Explanations for Schizophrenia. Psychological Explanations for Schizophrenia. Biological Treatment: Drug Therapy. Psychological Therapies: Family Therapy, Token Economies and Cognitive Author: Bruce Johnson.Download