Welcome to the World of Monkey Business!
In this chapter, we are going to dive into a fascinating study by Hassett et al. (2008). Have you ever wondered why boys often reach for toy trucks while girls might prefer dolls? Is it because of the way they are raised (socialisation), or is it something deep inside their biology? By looking at rhesus monkeys—who don't watch TV commercials or go to school—Hassett and colleagues tried to find out if "toy preferences" are biological. Don't worry if it sounds complex; we'll break it down together!
Prerequisite Concept: The Biological Approach
Since this study is part of the Biological Approach, it’s helpful to remember its two main "golden rules":
1. Our behavior, thoughts, and emotions can be explained by our brain, hormones, genetics, and evolution.
2. We can understand why people are similar or different by looking at these biological factors.
1. Background and Aim
The "Nature vs. Nurture" Puzzle
Psychologists have known for a long time that human children show sex differences in how they play. Boys usually like toys with wheels (stereotypical "masculine" toys), and girls often like plush toys or dolls (stereotypical "feminine" toys).
The big question is: Why?
Is it Nurture (parents and society telling them what to play with) or is it Nature (biological things like hormones influencing their brains)?
Did you know? To solve this, researchers looked at monkeys. Monkeys don't have "social expectations" or "gender roles" like humans do, so if they show the same preferences as humans, it suggests the cause is biological.
The Aim
The study aimed to see if rhesus monkeys would show the same sex-typed toy preferences as human children when given a choice between "masculine" (wheeled) and "feminine" (plush) toys.
Quick Review: The goal was to see if toy choice is driven by biology or by being taught how to act by society.
2. The Methodology
The Participants (The Monkeys!)
The researchers studied 82 rhesus monkeys living in a social group at a research center. They used a "multi-male, multi-female" group, meaning the monkeys lived together naturally in an outdoor area.
The Toys (The "Tools")
The monkeys were given two types of toys:
1. Wheeled Toys (Masculine): For example, a wagon, a truck, and a construction vehicle.
2. Plush Toys (Feminine): For example, Winnie the Pooh, Raggedy Ann, and a plush turtle.
The Procedure
1. The monkeys were tested in their outdoor area.
2. Two toys (one plush, one wheeled) were placed 10 meters apart on the ground.
3. The monkeys were allowed to interact with them freely.
4. Researchers used observation to record the behavior.
5. Each session lasted 25 minutes. They did 7 trials in total.
What was measured? (The Dependent Variable)
Researchers looked at "behaviours" using a behavioural checklist, including:
- Frequency of interaction: How many times did they touch the toy?
- Duration: How long did they play with it?
Memory Aid: Think of F.D.—Frequency and Duration. How OFTEN and how LONG.
Key Takeaway: This was a laboratory experiment (though in a naturalistic outdoor setting) using observation. The researchers used different toys to see how male and female monkeys reacted.
3. The Results
The findings were very clear for the males, but a bit more flexible for the females!
For Male Monkeys:
- They had a strong preference for wheeled toys.
- They rarely played with the plush toys.
- Example: The males interacted with wheeled toys significantly more often and for longer periods than they did with plush toys.
For Female Monkeys:
- They did not show a significant preference for one type over the other.
- However, when you compare them to the males, the females spent much more time playing with the plush toys than the males did.
- Interestingly, females were quite happy to play with both trucks and dolls!
Quick Summary Table:
Males: Wheeled > Plush (Strong preference)
Females: Wheeled = Plush (No strong preference, but played with plush more than males did)
4. Conclusions
The researchers concluded that toy preferences in monkeys parallel (match) those found in human children. Because the monkeys aren't influenced by human culture or advertising, this suggests that these preferences are biologically based.
The theory is that hormones (like testosterone) may shape the brain before birth, making males more interested in objects that move or can be used actively, while females may be more open to "social" or "nurturing" toys (like plush toys).
Key Takeaway: Biology plays a massive role in what we find interesting! Nature seems to provide the "base" for our preferences, which society then builds upon.
5. Evaluating the Study
When you look at a study in Psychology, you always need to look at its strengths and weaknesses.
Strengths
- High Control: The researchers used a clear behavioural checklist, which makes the study more objective (less biased).
- Validity: Using monkeys helps eliminate the "socialisation" factor, making it a "cleaner" test of biology than testing human children.
Weaknesses
- Generalisability: Can we really compare a rhesus monkey to a human child? Even though we are similar, monkeys aren't humans.
- Ethics: Using animals in research is always a debate. While the monkeys weren't physically harmed, they were kept in captivity for research purposes.
Common Mistakes to Avoid
- Don't say that females "preferred" plush toys. The results showed they played with both! It was the males who had the strong preference (for wheeled toys).
- Don't forget that this study did not include human participants. They used data from other studies to compare the monkeys' behavior to human children's behavior.
6. Issues and Debates
Nature versus Nurture
This is the "star" debate of this study. The results support Nature. Because monkeys don't have "toy commercials" or "gendered nurseries," their preference for specific toys must come from their internal biology.
The Use of Animals
Psychologists follow strict rules for animals:
1. Numbers: They used enough monkeys to get good data but didn't use more than necessary.
2. Housing: The monkeys lived in a naturalistic social group, which is better for their well-being than being alone in cages.
Key Takeaway Summary: Hassett et al. showed us that even in the animal kingdom, boys will be boys! By showing that male monkeys prefer "masculine" toys, they gave us evidence that our play choices are rooted in our biological makeup.