Welcome to the Psychology of Aggression!
Hi there! Welcome to your study notes for Aggression. This topic is part of your "Issues and Options" paper. We are going to explore why humans sometimes act aggressively. Is it something in our brains? Is it our genes? Or is it because of the video games we play?
Don’t worry if some of the biological terms seem a bit like "science-speak" at first. We’ll break them down using simple analogies so that by the end of this, you’ll be an expert. Let's dive in!
1. Biological Explanations: Neural and Hormonal
First, we look at the "hardware"—the physical stuff inside us that might trigger aggression.
The Limbic System
Think of the Limbic System as your brain's "emotional control center." Two key parts are important here:
• The Amygdala: This is like an emotional alarm bell. It processes fear and helps us respond to threats. If it's overactive, a person might see a small threat as a huge one and react aggressively.
• The Hippocampus: This part handles memories. If you encounter a situation that reminds you of a previous fight, your hippocampus signals the amygdala to react.
Neurotransmitters: Serotonin
Serotonin is a chemical that usually works like the "brakes" on a car. It has an inhibitory effect, meaning it keeps our moods stable and calm.
The Logic: Normal levels of serotonin = Good self-control.
Low levels of serotonin = The "brakes" aren't working, making impulsive aggression more likely.
Hormones: Testosterone
Testosterone is an androgen (male hormone), though everyone has it. It is linked to dominance and social status.
Real-world example: Have you ever noticed that in many species, males are more aggressive during mating season? This is often linked to peaks in testosterone. In humans, research shows that people with higher testosterone levels often score higher on scales of aggression.
Quick Review:
• Amygdala = The Alarm.
• Serotonin = The Brakes.
• Testosterone = The Accelerator.
2. Genetic Factors in Aggression
Could we be born to be aggressive? Psychologists use twin studies to find out. If identical twins (who share 100% genes) are more similar in their aggression than non-identical twins, genes likely play a role.
The MAOA Gene (The "Warrior Gene")
There is a specific enzyme called MAOA that breaks down neurotransmitters like serotonin.
• MAOA-H: High activity (breaks down chemicals efficiently).
• MAOA-L: Low activity (doesn't break them down as well).
People with the MAOA-L variant (the "Warrior Gene") are more likely to react aggressively when provoked. However, it’s not just about the gene! Research shows this gene usually only leads to aggression if the person also had a traumatic childhood. This is a great example of the nature-nurture interaction.
Key Takeaway: Aggression isn't caused by just one thing. It's often a mix of the MAOA-L gene and environmental triggers.
3. The Ethological Explanation
Ethology is the study of animal behavior in natural settings. Ethologists believe aggression is adaptive—it helps animals survive by winning territory or mates.
Key Concepts:
• Innate Releasing Mechanism (IRM): This is a built-in "sensor" in the brain. When it detects a specific trigger (like a rival's color), it triggers a response.
• Fixed Action Pattern (FAP): This is the response itself. It’s a set sequence of aggressive behaviors that is the same every time and can't be stopped once it starts.
Example: The male stickleback fish will attack anything with a red belly (the IRM). The specific way it attacks is the FAP.
Did you know? Ethologists noticed that animal aggression is often ritualistic. They might growl or show teeth to settle a fight without actually killing each other. This ensures the species survives!
4. Evolutionary Explanations
Evolutionary psychologists ask: "How did aggression help our ancestors survive and pass on their genes?"
Sexual Jealousy and Paternal Uncertainty
In the past, men couldn't be 100% sure a child was theirs (paternal uncertainty). To prevent "cuckoldry" (raising another man's child), men evolved mate retention strategies. These can be aggressive, such as monitoring a partner's movements or threatening rivals. While these behaviors are harmful today, evolutionists argue they were "survival strategies" thousands of years ago.
5. Social Psychological Explanations
Now we move away from biology and look at how our environment and thoughts shape aggression.
Frustration-Aggression Hypothesis
This theory says that frustration always leads to aggression.
How it works:
1. You have a goal (e.g., getting a drink from a vending machine).
2. Something blocks that goal (the machine steals your money).
3. You feel frustration.
4. This creates an aggressive drive, leading to an outburst (hitting the machine).
Catharsis: This theory suggests that acting aggressively lets off steam, making you feel better. (Note: Modern research actually suggests the opposite—aggression usually leads to more aggression!)
Social Learning Theory (SLT)
Proposed by Albert Bandura, SLT says we learn aggression by watching others.
• Observation: A child sees a parent or TV character act aggressively.
• Vicarious Reinforcement: If the child sees the "model" get rewarded for aggression (e.g., getting what they want), the child is more likely to copy them.
Memory Aid: ARRM
To learn aggression, you need:
Attention (Notice it)
Retention (Remember it)
Reproduction (Be physically able to do it)
Motivation (Have a reason to do it)
De-individuation
Have you ever noticed people act more wildly in a big crowd or when wearing a mask? That’s de-individuation. When we lose our individual identity, we feel less "accountable" for our actions. Our "inner restraints" disappear, and we follow the group's aggressive behavior.
6. Institutional Aggression in Prisons
Why is there so much violence in prisons? There are two main theories:
1. The Importation Model (Dispositional): This says prisoners import their aggressive personalities from the outside world into the prison. The violence is caused by the people, not the place.
2. The Deprivation Model (Situational): This says the prison environment causes the violence. Being deprived of freedom, comfort, and safety makes prisoners stressed and aggressive. The violence is caused by the place, not the people.
Quick Review:
• Importation = It’s the person.
• Deprivation = It’s the situation.
7. Media Influences on Aggression
Does playing Call of Duty or Grand Theft Auto make you aggressive? Psychologists look at three processes:
Desensitisation
Normally, seeing violence causes physical stress (heart racing, sweating). If we see it constantly in games, we get "used to it." Our physical response lowers, and we become less sympathetic to victims in real life.
Disinhibition
Most of us are taught that aggression is "wrong." However, in video games, aggression is often rewarded. This changes our social rules (inhibitions), making us feel that aggression is a normal or acceptable way to solve problems.
Cognitive Priming
Violent media provides us with "scripts"—ready-made ways to react to a situation. If someone bumps into you in a hallway, and you’ve just played a violent game, your brain "primes" an aggressive script, making you more likely to snap at them.
Final Summary Table
Biological: Limbic system, Low Serotonin, High Testosterone, MAOA-L gene.
Ethological: Aggression is innate; IRMs and FAPs.
Evolutionary: Aggression helped us keep mates and survive.
Social: Frustration, Learning from others (SLT), and Crowds (De-individuation).
Media: Desensitisation, Disinhibition, and Priming.
Don't worry if this feels like a lot! Just remember: Aggression is a "multi-story" building. Some stories are biological, some are social, and some are about the world around us. Good luck with your revision!