UNDERSTAND YOUR BRAIN ❤️

EMOTIONS

why do you feel what you feel?

A neurobiological response your brain generates when it decides something matters.

Emotions aren't controlled by one single part of your brain. They emerge from interactions between brain regions, neural networks, hormones, neurotransmitters, memories and your environment.

⚡
Emotion
Usually a response to something specific and tends to be relatively short-lived.
Example
Someone says something embarrassing about you → you feel embarrassed.
🌊
Mood
Usually lasts longer and doesn't necessarily have one clear cause.
Example
You feel irritated or low throughout the day without one obvious reason.

Emotions and moods influence each other.

Repeated frustrating events can affect your mood, while your existing mood can influence how strongly you respond to something new.

Your emotions are a team effort

The limbic system is not a single structure but a collection of interconnected brain regions that work together to process emotions, form memories, and evaluate rewards.

🚨
Amygdala
Emotional significance + possible threats
The amygdala is often called the "alarm system." It detects emotionally significant stimuli, particularly threats, and can trigger a response before the conscious mind has fully processed what is happening. It doesn't only handle fear — it's involved in processing the emotional significance of all kinds of stimuli, positive and negative.
→ See in Brain Anatomy
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Hippocampus
Memory + context
The hippocampus sits right next to the amygdala and provides context. It connects current events to memories, so the brain can evaluate whether a situation is genuinely dangerous or just reminds you of something that was dangerous before.
→ See in Brain Anatomy
⚙️
Hypothalamus
Brain ↔ body
The hypothalamus is the bridge between the brain and the body's hormonal system. When the amygdala flags something as significant, the hypothalamus activates the autonomic nervous system and the HPA axis (the body's main stress-response system).
🎯
Nucleus accumbens
Reward + motivation
The nucleus accumbens, part of the ventral striatum (the brain's reward centre), is the brain's primary reward-processing region. It responds to dopamine signalling and is heavily involved in motivation, pleasure, and evaluating whether something is "worth it."
→ Dopamine in Brain Chemistry
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Prefrontal cortex
Evaluation + regulation
The PFC evaluates situations, plans, weighs consequences, inhibits impulses, and modulates emotional responses.
→ See in Brain Anatomy

So, how does an emotion actually happen?

💥
Something happens
A stimulus arrives — something you see, hear, feel or sense.
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👀
Sensory information
The thalamus receives and routes it.
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Amygdala
"Is this emotionally significant?"
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Hippocampus
"Does this remind me of something?"
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🧠
Prefrontal cortex
"How should I interpret and respond to this?"
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⚙️
Hypothalamus
Helps coordinate the body's response.
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🧪
Neurotransmitters + hormones
Shape the response.
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❤️
Conscious emotion
You become aware of what you're feeling.

By the time you're consciously aware of what you're feeling, your brain has already assessed the stimulus, triggered a body response, released chemicals and begun preparing behaviour.

The six basic emotions

Anger, disgust, fear, happiness, sadness, and surprise are classified as the six main emotions.

💡
Current neuroscience increasingly suggests emotions are more like a spectrum than six discrete boxes. The six basic emotions are a useful starting point, not the final word.
😨
FEAR
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😡
ANGER
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🤢
DISGUST
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😄
HAPPINESS
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😢
SADNESS
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😮
SURPRISE
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😨
Fear
Primary brain region
Amygdala
Brain regions involved
Amygdala → Hypothalamus → Autonomic nervous system
The threat-response pathway
When the amygdala detects a potential threat, it signals the hypothalamus, which activates the sympathetic nervous system. This triggers a rapid chain of body responses:
🫀
Heart beats faster
Pumps more blood to your muscles and main organs.
🫁
Breathing speeds up
Opens your airways to take in more oxygen.
👁️
Pupils get bigger
Lets in more light so you can see better.
🍽️
Digestion slows down
Stops non-important tasks to save energy for your muscles.
🩸
Blood sugar rises
Releases stored energy to give you quick fuel.
🛡️
Pain feels lower
Blunts your sense of pain for a short time.
😡
Anger
Brain regions involved
Amygdala · Orbitofrontal cortex · Anterior cingulate cortex
How anger happens
Something blocks your goal
→
🚨 Amygdala — "This matters."
→
🧠 PFC / orbitofrontal cortex — "How should I respond?"
→
🧪 Chemical signalling
→
❤️ Anger
What happens next?
What happens next is not automatic. Your prefrontal cortex can evaluate the situation and help shape your response — this is where emotional regulation comes in.
🤢
Disgust
Primary brain regions
Insula — processes information about tastes, smells and visceral sensations.
Basal ganglia — a group of deep brain structures involved in smooth body movement, learning and habits.
What happens
The insula generates the nausea or revulsion response. The basal ganglia help coordinate the withdrawal response, such as pulling away or spitting something out.
Disgust can also be triggered by moral violations — not just tastes and smells.
Key chemical signalling
Changes in serotonin and dopamine signalling may occur in relevant circuits
😄
Happiness
Primary brain region
Ventral striatum (nucleus accumbens)
What happens
Reward-related dopamine signalling involving the nucleus accumbens contributes to responses to rewarding stimuli such as food, social connection, achievement and novelty.
Serotonin levels contribute to sustained feelings of contentment and wellbeing.
Key chemicals involved
These chemicals interact as part of broader brain systems — no single chemical creates an emotion on its own.
Dopamine → reward, motivation, pleasure Serotonin → mood stability, contentment Endorphins → euphoria, pain relief Oxytocin → social bonding
→ Learn more in Brain Chemistry
😢
Sadness
Primary brain regions
Anterior cingulate cortex — a collar-shaped brain region that links emotion with thinking.
Insula — links inner body feelings with outside emotions and self-awareness.
Also involved: Amygdala · Prefrontal cortex
What happens
Changes in serotonin and dopamine activity in relevant circuits can be associated with reduced motivation and energy.
The anterior cingulate cortex, involved in emotional pain processing, can become highly active — which may help explain why emotional pain can sometimes feel almost physical.
The parasympathetic nervous system can contribute to slowing the body down, including withdrawal, low energy and crying.
Key chemical signalling
Not every episode of sadness produces the same chemical changes — these are associated processes, not a universal formula.
Changes involving serotonin and dopamine Increased cortisol may occur during prolonged stress/sadness
💙
Sadness is a normal human emotion. It is not the same as depression or other mental health conditions, which involve persistent changes over time.
😮
Surprise
What happens
A sudden, unexpected stimulus causes a burst of noradrenaline from the locus coeruleus (a small brain region involved in releasing noradrenaline and regulating alertness and attention), which heightens attention and alertness.
Brain regions involved
Amygdala → evaluates whether the surprise is threatening or pleasant.
Hippocampus → checks memory for context.
PFC → rapidly recalibrates expectations.
Surprise is extremely brief — essentially a neural "reset" that clears the brain's current processing and redirects attention.
Key chemical signalling
Noradrenaline → burst of attention and alertness Dopamine → may be involved when the surprise is rewarding/pleasant

Why do teen emotions sometimes feel so intense?

Emotional, social and reward-related factors can sometimes have a stronger influence on behaviour during adolescence, particularly in highly exciting or socially significant situations.

During adolescence, reward and motivation systems can be highly responsive, while the brain networks involved in cognitive control and evaluating long-term consequences are still developing.

This creates situations where an immediate reward can sometimes feel more important than a distant consequence.

🎯
Reward + motivation
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Cognitive control
💡
This doesn't mean teenagers "have no control." It means these systems are interacting and developing — and that's a normal part of brain development.

Why do friends matter so much?

Being around friends can increase the social reward associated with certain choices, potentially influencing adolescent decision-making.

Teenagers can become particularly sensitive to socially meaningful experiences such as:

Think about it
You're with your friends and they suggest doing something you wouldn't normally do.
The social context can influence the reward your brain associates with a decision. This doesn't mean you automatically make worse choices around friends — it means your brain weighs social factors as part of the decision.

Why doesn't everyone react the same way?

We all share the same basic biological systems for processing emotions. But individual emotional responses can be shaped by:

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Memory & learning
The hippocampus connects current events to past experiences. What you've lived through shapes how your brain interprets what's happening now.
🌍
Cultural context
Different cultures teach different emotional norms — how you're expected to express, suppress or value different emotions.
🏠
Environment & chronic stress
High-stress environments can affect amygdala sensitivity and HPA-axis responsiveness, influencing how strongly you react to new situations.
Same basic biological systems.
Different experiences.
Different emotional responses.
Simple enough to understand. Interesting enough to keep reading. Accurate enough to be scientifically responsible.

Your emotions are produced by interconnected brain systems, shaped by chemistry, and influenced by your unique experiences.