Health psychology

Welcome to Health Psychology!

In this chapter, we are going to explore why people engage in behaviors that are bad for their health—specifically focusing on drug addiction. We will look at how the brain works, how we learn habits, and how psychologists try to help people quit. Don't worry if some of the biological terms seem tricky at first; we will break them down into bite-sized pieces!

1. The Basics: Key Terms in Addiction

Before we dive into the theories, we need to understand the "language" of health psychology. You can think of these five terms as the foundation of the house we are building.

• Addiction: A mental or physical need to keep taking a substance or performing a behavior, even when it causes harm.
• Tolerance: This is like your brain getting "used to" a drug. Over time, you need more of the substance to get the same "high" you felt the first time. Analogy: Like a coffee drinker who started with one cup but now needs four just to wake up.
• Physical Dependency: When your body has adapted to the drug so much that it needs it to function normally.
• Psychological Dependency: When you feel you can't cope with life or emotions without the drug (e.g., "I need a cigarette to deal with this stress").
• Withdrawal: The nasty physical and mental symptoms that happen when someone stops taking a drug they are addicted to (like shaking, sweating, or extreme sadness).

Quick Review: Physical dependency is about the body needing the drug; psychological dependency is about the mind feeling it needs the drug.

Key Takeaway: Addiction isn't just "liking" something; it involves complex changes in the brain and body that make stopping very difficult.

2. Why Do People Get Addicted? (Explanations)

Psychologists look at addiction through two main lenses: Biology (the brain) and Learning (environment).

A. Biological Explanation: The Reward System

Our brains have a "reward pathway." When we do something good (like eating), the brain releases a chemical called Dopamine, which makes us feel great. Drugs hijack this system.

• Mode of Action: Different drugs work in different ways. For example, Heroin mimics the body’s natural painkillers (endorphins), while Nicotine triggers the release of adrenaline and dopamine.
• Alcohol: Affects neurotransmitters like GABA (which slows things down) and Glutamate, eventually leading the brain to rely on alcohol to stay balanced.

B. Learning Explanation: Habit and Environment

This theory says we "learn" to be addicts through our surroundings.

• Operant Conditioning: If taking a drug makes you feel good (Positive Reinforcement) or stops you from feeling stressed (Negative Reinforcement), you are likely to do it again.
• Classical Conditioning: You might associate "the pub" or "certain friends" with drinking. These places/people become cues that trigger cravings.
• Social Learning Theory: We copy role models. If a teenager sees an "older, cool" sibling smoking, they may imitate that behavior to fit in.

Memory Aid: Remember the "Three C's" for Learning: Consequences (Operant), Cues (Classical), and Copying (Social Learning).

Key Takeaway: Addiction is a mix of "nature" (your brain's chemistry) and "nurture" (what you see and experience in your environment).

3. How Do We Treat Addiction?

Since there are different causes for addiction, there are different ways to treat it!

A. Aversion Therapy

This uses Classical Conditioning to make the drug taste or feel disgusting. Example: A person takes a drug called Antabuse that makes them feel violently sick if they drink even a tiny bit of alcohol. The goal is to make the person associate alcohol with vomiting instead of pleasure.

B. Biological Treatments

• Methadone (for Heroin): A "substitute" drug that satisfies the craving but is safer and controlled by doctors.
• Nicotine Replacement Therapy (NRT): Using patches or gum to give the body small amounts of nicotine without the dangerous smoke of a cigarette.

C. Psychological Strategies & Campaigns

Governments use Anti-Drug Campaigns to change behavior. These often use:

• Fear Appeals: Showing the scary consequences of drugs.
• Social Norms: Telling people that "most people don't actually do drugs," which reduces the pressure to fit in.

Key Takeaway: Treatments can either target the body (medication) or the mind (re-training your associations).

4. The Key Studies

You need to know specific research to back up your points in the exam.

The Classic Study: Olds and Milner (1954)

The Goal: To find the "reward center" of the brain.
What they did: They put electrodes into the brains of rats. When the rats pressed a lever, they got a tiny electric shock to a specific part of the brain (the septal area).
The Result: The rats liked the feeling so much they pressed the lever up to 2,000 times an hour! They even ignored food and water just to keep pressing the lever.
Why it matters: It proved that the brain has a specific "reward" area that can drive behavior more than even basic survival needs.

A Contemporary Study: Mundt et al. (2012)

The Goal: To see how peer groups affect alcohol use in teenagers.
The Result: They found that teenagers tend to hang out with people who have similar drinking habits (Peer Selection), but they also influence each other to drink more over time (Peer Influence).
Why it matters: It shows that addiction is a social process, not just an individual one.

Key Takeaway: Olds and Milner shows the Biological side (brain hardware), while Mundt et al. shows the Social/Learning side (software/environment).

5. Research Methods in Health Psychology

How do we get this data? We have to be careful, especially with ethics.

• Animal Studies: Like Olds and Milner. Pro: We can do things we can't do to humans. Con: Is a rat's brain really the same as a human's? There are also big ethical concerns about causing pain to animals.
• Human Studies: Using questionnaires or interviews. Problem: People often lie about drug use because they are embarrassed (this is called Social Desirability Bias).
• Data Analysis:
  • Chi-Squared: Used when we are looking for a difference between categories (e.g., smokers vs. non-smokers).
  • Spearman’s Rho: Used when looking for a relationship or correlation (e.g., does the number of hours spent with drinking friends correlate with how much alcohol you drink?).

Common Mistake to Avoid: Don't say a correlation "proves" that one thing caused another. It just shows they are linked!

Key Takeaway: Researchers must balance the need for knowledge with the ethical treatment of both animals and humans.

6. Issues and Debates

To get those top marks, you need to think about the "big picture."

• Nature vs. Nurture: Is addiction in your genes/brain (Nature) or is it how you were raised (Nurture)? Most psychologists today say it's both!
• Reductionism: Is it too simple to say addiction is only about dopamine? Some argue this ignores the person's life problems or poverty.
• Social Control: If we use drugs like Antabuse to "force" people to stop drinking, are we taking away their free will? Is it okay for the government to use "fear" in adverts?
• Psychology as a Science: Using lab experiments (like brain scans or rat studies) makes Health Psychology very scientific because the results are objective and can be tested again.

Key Takeaway: Health psychology is a "scientific" field, but it must constantly deal with the messy reality of human life and ethics.

Don't worry if this feels like a lot! Start by mastering the key terms (Section 1), then pick one Biological and one Learning explanation to learn deeply. You've got this!