Eduqas A-Level Psychology A290QS
Biological Approach
Psychodynamic Approach
Behaviourist Approach
Cognitive Approach
Positive Approach
Comparing the Five Approaches
Core Studies in Social and Developmental Psychology
Planning Psychological Research
Data Handling, Statistics and Mathematical Skills
Evaluating and Validating Research
Personal Investigations and Novel Research Scenarios
Addictive BehavioursAddictive
Autistic Spectrum BehavioursAutistic spectrum
Bullying BehavioursBullying
Criminal BehavioursCriminal
SchizophreniaSchizophrenia
StressStress
Controversies in Psychology
Schizophrenia
Biological explanations: Cannabis, genetics and the diathesis-stress model
- 3 things to know
- Component 3 Applications
Overview
Evidence linking cannabis to psychosis from D'Souza, the Swedish conscript study, Arseneault and Di Forti, family, twin and genome studies, and how the diathesis-stress model combines biological and environmental factors.
What you need to know
Answer each one before you reveal it.
What did Arseneault and colleagues (2002) add about age of use?
What did Di Forti and colleagues (2019) report about cannabis potency?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What did D'Souza and colleagues (2004) demonstrate?
Model answer
Administering THC to healthy volunteers produced transient positive and negative symptoms together with cognitive impairment, which resolved afterwards.
- 2
What did the Swedish conscript study by Andreasson and colleagues (1987) find?
Model answer
Men reporting heavy cannabis use at conscription were substantially more likely to receive a diagnosis of schizophrenia in the following years.
- 3
What did Arseneault and colleagues (2002) add about age of use?
Model answer
Cannabis use beginning in early adolescence was associated with a greater increase in risk than use beginning later, suggesting the developing brain is more vulnerable.
- 4
What did Di Forti and colleagues (2019) report about cannabis potency?
Model answer
Daily use of high-potency cannabis was associated with a much greater likelihood of a first episode of psychosis, and rates differed between cities according to the type of cannabis available.
- 5
Give one reason the cannabis-psychosis association may not be causal.
Model answer
People in the early stages of psychosis may use cannabis to relieve distressing experiences, so the drug use could be a consequence rather than a cause.
- 6
What pattern do family, twin and adoption studies of schizophrenia show?
Model answer
Risk rises with closeness of genetic relationship to an affected person and is far higher in identical than in non-identical twins, but concordance falls well short of complete.
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