Welcome to Child Psychology!
Ever wondered why teenagers seem to make risky decisions, or how a tiny baby knows not to crawl off the edge of a bed? That is exactly what Child Psychology is all about! In this chapter, we look at how we grow from infants into young adults. We will explore how our brains develop, how we learn to see the world, and how we form the important emotional bonds called attachments.
Don’t worry if some of the biological terms seem tricky at first—we will break them down using simple analogies and real-world examples. Let’s dive in!
1. Pre-adult Brain Development
Why do adolescents (teenagers) sometimes do things that seem "dangerous" to adults, like reckless driving or trying substances? It isn't just "being a rebel"—it’s actually down to how the brain is "under construction."
The Background: The Brain’s Balancing Act
Think of the teenage brain like a high-performance sports car with a very powerful engine but weak brakes.
- The Ventral Striatum (The Engine): This part of the brain is obsessed with rewards. In teenagers, this area is highly active. It makes the "thrill" of a risk feel much better than it does for an adult.
- The Pre-frontal Cortex / PFC (The Brakes): This area is responsible for logic, self-control, and planning. The problem? The PFC doesn’t fully finish developing until your mid-20s!
- The Amygdala: This handles emotions. In teens, it often reacts before the logical PFC can chime in.
- Dopamine: This is the brain’s "feel-good" chemical. Teenagers have a higher "drive" for dopamine, which pushes them toward exciting (and sometimes risky) activities.
Key Study: Barkley-Levenson and Galván (2014)
The Aim: To see if the adolescent brain reacts differently to "expected value" (the idea of winning money) compared to adult brains.
What they did: They used an fMRI scanner (a big machine that looks at brain activity) while participants played a gambling game. They compared adolescents to adults.
The Results: When there was a chance to win money, the Ventral Striatum in teenagers lit up much more than in adults. Even when the risk was the same, the teenagers' brains "valued" the reward more.
Practical Application: Reducing Risk
Since we know teen brains are wired for reward, we can use graduated driver schemes. Instead of giving a 17-year-old full driving freedom, they earn it in stages (e.g., no driving at night or with many passengers at first) to let their "logical brakes" catch up with their "reward engine."
Quick Review: Teenagers take risks because their Ventral Striatum (reward) develops faster than their Pre-frontal Cortex (control).
2. Perceptual Development
Perception is how we make sense of the information our senses (like sight) give us. Are we born knowing how deep a hole is, or do we learn it?
The Background: Making Sense of the World
Babies have to learn several "constancies." A constancy is knowing an object stays the same even if it looks different.
- Size Constancy: Knowing a bus is still huge, even when it looks tiny because it’s far away.
- Shape Constancy: Knowing a door is a rectangle, even when it’s half-open and looks like a trapezoid.
- Depth Perception: The ability to tell how far away something is (and if we might fall!).
Key Study: Gibson and Walk (1960) – The Visual Cliff
The Setup: Imagine a table. One half is solid wood. The other half is clear glass. Under the glass, a "checkerboard" pattern is placed way down on the floor, making it look like a cliff.
The Participants: Human infants (6-14 months) and various baby animals (chicks, kids, kittens).
The Results: Most babies would crawl on the "shallow" side but refused to crawl over the glass "cliff" to their mothers, even if their moms were calling them. This shows that by the time we can crawl, we have depth perception—it helps keep us safe!
Practical Application: Helping Development
We use Sensory Integration Therapy (SIT) to help children who struggle to process sensory information. Through play (like swinging, jumping, or touching different textures), children help their brains "wire" their perceptions of shape, size, and balance correctly.
Did you know? Newborn kittens will also avoid the "visual cliff" as soon as their eyes open, suggesting some of this is innate (we are born with it!).
3. The Development of Attachment
Attachment is the deep emotional bond between a child and their primary caregiver (usually a parent). It’s not just about who feeds the baby!
The Background: Nature vs. Nurture
- Bowlby’s Evolutionary Theory (Nature): Bowlby argued that we are born with an "attachment instinct." Babies stay close to parents to stay safe from predators. It's about survival.
- Learning Theory (Nurture): This theory suggests babies love their parents simply because the parents provide food. We "learn" to be attached because of rewards.
- Privation vs. Deprivation:
Deprivation: Losing an attachment bond that was already there (e.g., a parent going away for a long time).
Privation: Never having the chance to form a bond at all (e.g., in some poor-quality orphanages).
Key Study: Ainsworth and Bell (1970) – The Strange Situation
The Procedure: A controlled observation where a mother and baby are in a room. A stranger enters, the mother leaves, and then the mother returns. Psychologists watch how the baby reacts.
The Three Types of Attachment:
- Secure: The baby is upset when mom leaves but happy and easily calmed when she returns. (About 70% of kids).
- Insecure-Avoidant: The baby doesn’t seem to care if mom leaves and ignores her when she comes back.
- Insecure-Resistant: The baby is extremely upset when mom leaves but angry or fussy when she returns, struggling to be comforted.
Practical Application: Key Workers
In nurseries, we use the Key Worker system. Instead of a baby being looked after by 10 different people, they are assigned one specific person to bond with. This reduces the "stress of separation" and helps the child feel secure while the parent is at work.
Memory Aid: Remember the 3 S's of Secure Attachment: Separation distress, Stranger anxiety, and Secure base behavior (using mom as a "base" to explore from).
Quick Chapter Summary
1. Brains: Adolescents take risks because their "reward center" (Striatum) is stronger than their "logical center" (PFC).
2. Perception: The "Visual Cliff" shows we develop depth perception very early to stay safe. Play helps us learn that objects stay the same shape and size.
3. Attachment: Bonds are vital for survival. The "Strange Situation" helps us see if a child feels secure or insecure, which affects how they see the world.
Common Mistake to Avoid: Don't confuse Privation and Deprivation! Deprivation is a Damage to an existing bond. Privation is the Permanent lack of any bond.