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
Addictive Behaviours
Biological explanations: Dopamine
- 3 things to know
- Component 3 Applications
Overview
Recall questions on Biological explanations: Dopamine.
What you need to know
Answer each one before you reveal it.
Explain the causal problem with scans showing fewer D2 receptors in addicted people.
What did Alexander's Rat Park studies suggest about a purely pharmacological account of addiction?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Name the pathway at the centre of the dopamine explanation and the two structures it connects.
Model answer
The mesolimbic pathway, running from the ventral tegmental area to the nucleus accumbens.
- 2
What did Olds and Milner (1954) demonstrate?
Model answer
Rats pressed a lever at very high rates to deliver electrical stimulation to a septal region of their own brains, giving the first direct evidence of a brain reward system.
- 3
Explain how cocaine raises synaptic dopamine.
Model answer
It blocks the dopamine transporter that normally takes dopamine back into the presynaptic neuron, so dopamine stays in the cleft and its effect is prolonged.
- 4
Explain how nicotine raises dopamine in the nucleus accumbens.
Model answer
It binds to nicotinic acetylcholine receptors on ventral tegmental area neurons, increasing their firing and so increasing dopamine release downstream.
- 5
If a drug repeatedly floods the synapse with dopamine, how does the brain adapt and what follows?
Model answer
It reduces the number and sensitivity of dopamine receptors, so ordinary rewards feel flat and larger doses are needed, producing tolerance and low mood between uses.
- 6
What distinction do Robinson and Berridge (1993) draw in incentive-sensitisation theory?
Model answer
Between wanting and liking: repeated use sensitises the dopamine wanting system so craving grows, even while the pleasure actually obtained from the drug declines.
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