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Understanding and Modifying Addictive Behaviours

An overview of biological, psychological, and social factors contributing to addiction, and methods for effective intervention.

Biological Basis: Key Mechanisms

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Addiction Genes

Research suggests that addiction has a hereditary component. Variations in genes related to dopamine pathways affect reward sensitivity.
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Disease of the Brain

Chronic substance use alters neural circuits involved in reward, motivation, memory, and self-control.
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Prefrontal Cortex

Impairment here is central to decision-making and impulse control, explaining why addicted individuals struggle to quit.
pleasure

Dopamine

Neurotransmitter linked to pleasure and reward. Elevated levels reinforce behaviours, leading to tolerance.

The Dopamine Cycle of Addiction

Substance Use ↑ Dopamine (Mesolimbic System) → Reinforcement & Euphoria → ↓ Dopamine Sensitivity (Tolerance)
This cycle drives the need for more of the substance or behaviour for the same effect, leading to compulsive seeking and driving addiction.

Individual Psychological Vulnerability

1

Cognitive Biases

Individuals might underestimate the risks or overestimate their control over use (illusory control). Confirmation bias reinforces denial.
2

Field Dependence

Those who are more field-dependent may struggle to resist addiction triggers present in their surroundings (e.g., peer pressure or locations).
3

Lang's Personality Traits

Traits like high impulsivity, sensation-seeking, and negativity bias raise vulnerability by driving individuals to seek immediate rewards.

Cognitive Distortion Check

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Peer pressure is only a problem for teenagers, not adults.
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Social influence is critical. Being in a network where use is common increases exposure and perceived acceptability across all age groups.

Social Context & Comorbidity

Co-morbidity and Self-Medication

Addiction often co-occurs with mental health disorders such as depression, anxiety, or PTSD. Individuals may use substances to self-medicate or escape distressing symptoms, complicating treatment and increasing severity.

Pharmacological Interventions

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Agonist Substitution Uses drugs that mimic the effects of the addictive substance but in a controlled way to reduce withdrawal and cravings (e.g., methadone for heroin addicts).
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Antagonist Substitution Uses drugs that block the effects of the addictive substance (e.g., naltrexone blocks opioid effects), aiming to prevent the reinforcing feelings of euphoria.

Behavioural Modification Tip

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Aversion Therapy: This behavioural technique pairs the addictive behaviour or substance use with an unpleasant stimulus to create a negative association. For example, disulfiram causes sickness if alcohol is consumed.

Modern Treatment Portfolio

Other modern treatments focus on modifying behaviour patterns, improving coping strategies, and strengthening social support to sustain long-term recovery.

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Cognitive-Behavioural Therapy (CBT)

Focuses on modifying behaviour patterns and improving coping strategies.
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Contingency Management

Uses positive reinforcement (rewards) for desired behaviours like abstinence.
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Family Therapy

Aims to strengthen social support and address family dynamics related to addiction.
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Biological Explanations of Addictive Behaviours
Term
Genetic Component of Addiction

What is the genetic component of addiction?

Answer
Explanation

Certain genes predispose individuals to addiction by affecting brain response to substances.

Term
Dopamine Pathways

How do dopamine pathways influence addiction?

Answer
Explanation

Variations in dopamine-related genes affect reward sensitivity, increasing addiction risk.

Term
Disease of the Brain

Why is addiction called a "disease of the brain"?

Answer
Explanation

Because chronic use changes brain structure and function, especially in areas like the prefrontal cortex.

Term
Dopamine's Role

What role does dopamine play in addiction?

Answer
Explanation

Dopamine increases feelings of pleasure, reinforcing addictive behaviours through the brain's reward system.

Term
Tolerance in Addiction

What causes tolerance in addiction?

Answer
Explanation

The brain reduces dopamine sensitivity over time, requiring more substance for the same effect.

Term
Cognitive Biases

What are cognitive biases in relation to addiction?

Answer
Explanation

Distorted thinking patterns that underestimate risks or overestimate control over addictive behaviour.

Term
Field Dependence

What is field dependence and its effect on addiction?

Answer
Explanation

Reliance on external cues increases vulnerability to triggers in the environment.

Term
Peter Lang's Personality Traits

According to Peter Lang, which personality traits increase addiction risk?

Answer
Traits

High impulsivity, sensation-seeking, and negativity bias.

Term
Peer Pressure

How does peer pressure contribute to addiction?

Answer
Explanation

Social influence increases exposure and acceptance of addictive behaviours.

Term
Agonist Substitution Therapy

What is agonist substitution therapy?

Answer
Therapy

Using a safer drug that mimics the addictive substance to reduce withdrawal and cravings.

Term
Aversion Therapy

How does aversion therapy work?

Answer
Therapy

It pairs addictive behaviours with unpleasant stimuli to discourage use.

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🧠 Biological Explanations of Addictive Behaviours Quiz

1. Which neurotransmitter is primarily involved in the brain’s reward system linked to addiction?

Dopamine increases feelings of pleasure and reinforces addictive behaviours in the brain’s reward pathway.

2. What does “agonist substitution” therapy involve?

Agonist substitution uses controlled drugs to reduce cravings safely (e.g., methadone for heroin).

3. Which brain region is impaired in addiction, leading to difficulty in impulse control?

The prefrontal cortex governs decision-making and self-control, which are disrupted in addiction.

4. Family and twin studies show addiction risk is higher due to:

Genetic factors increase vulnerability to addictive behaviours.

5. Cognitive biases in addiction commonly involve:

These biases maintain addiction by distorting risk evaluation and control beliefs.

📊 Results

  • Notes and Quiz
  • Psychology
  • AS & A Level
  • Addiction
  • WJEC