Conscious and Behavior cut.
The Brain's Awake and Asleep Modes!
We'll learn about how our brain works when we're awake and when we're asleep.
We'll also see how our feelings, what makes us want to do things, and how we learn and remember stuff all connect to our brain.
What Does "Being Awake" Mean?
How awake are we? This means how alert our brain is, like being wide awake, sleepy, fast asleep, or even in a very deep sleep called a coma.
What we feel when we're awake: This is when we know what we're thinking, feeling, or seeing. It's different from when we're sleepwalking and don't remember it later.
Coma and "Brain Death"
Coma: When someone is in a very deep sleep and can't wake up or respond. Sometimes they can get better, sometimes not.
Brain Death: This means the brain has stopped working forever, and the person can't come back.
Why Do We Sleep?
Sleeping helps our brain get stronger so we can remember things we learned during the day. It's like charging our brain's batteries!
If we don't sleep enough, we forget things easily and can get sick more often.
Sleeping is super important to keep us healthy and strong.
How Do We Know if Someone is Awake or Asleep?
We can watch what they do, like if they're talking or moving.
Doctors can also use a special machine called an EEG that reads our brain waves.
What is an EEG?
An EEG is like a special hat with sensors that can listen to the tiny electrical messages our brain cells send to each other. It doesn't hurt at all!
Brain Waves
Our brain makes different kinds of electrical patterns, or "waves," depending on what we're doing.
When we're awake, our brain makes fast waves. When we're falling asleep or in deep sleep, it makes slower waves.
How We Sleep
We have two main types of sleep: REM sleep (Rapid Eye Movement) and NREM sleep.
NREM sleep has three stages: light sleep, a little deeper sleep, and then very deep sleep.
Our sleep goes in cycles, where we go through NREM and REM sleep. These cycles usually last about 90 to 100 minutes. We dream more during REM sleep, especially closer to morning.
Brain Chemicals for Sleep and Wake
Our brain uses special chemicals (like tiny messengers) to tell us when to be awake and when to be sleepy.
Some chemicals like serotonin help us stay awake, while others help us fall asleep.
What it Means to Be "Aware"
This is when we know what's happening around us, what we're feeling inside, how time is passing, and we can make choices.
How We Focus
Selective Attention is like having a superpower to focus on one important thing, even if there's a lot going on around us. Our brain helps us ignore less important stuff.
Why We Do Things and How We Feel
Motivations: These are the reasons we do things, like eating when we're hungry (that's a super important motivation!) or wanting to get good grades.
Our brain has a special "reward pathway" that makes us feel good when we do things that are important, like eating yummy food or learning something new.
What are Emotions?
Emotions are how we feel, like happy, sad, or angry. They have a part where we think about them, a part where our body feels them (like a fast heart), and a part where we show them (like smiling).
Some feelings are inside us, and some we show to others.
When Our Brain Acts Differently
Sometimes, things like certain medicines or even some sicknesses can make our brain work differently, changing how we think or feel.
Sadness and Mood Swings
Depression: When someone feels very sad for a long time and doesn't enjoy things they used to.
Bipolar Disorder: When someone feels extremely happy and full of energy sometimes, and then very, very sad at other times.
Learning and Remembering
Learning: This is when we get new information or learn a new skill, like riding a bike.
Memory: This is how our brain keeps that information safe so we can use it later. We have memories for facts and memories for how to do things.
How Memories Are Made
When we learn something new, the connections between our brain cells get stronger (like making a thicker, easier path). This helps us remember. Sometimes these connections can get weaker too, if we don't use them.