How does the teenage brain develop, and why do teens sometimes take risks without thinking? What brain development teaches parents about patience and limits.
Your sixteen-year-old son is bright enough to prepare for a maths olympiad and logical enough to surprise you in an argument. Yet the same young man, egged on by his friends' cheers, rides a scooter down a hill with no hands, or gets into the car of someone he has never met in the middle of the night. "How can such a clever child do something like this?" is a question that occupies many parents' minds. An important explanation for this contradiction lies in research on the teenage brain. In adolescence the brain is not just an organ that grows; it is one that fundamentally reorganises itself. This restructuring gives young people a great capacity for learning, creativity and courage, while at the same time making it easier for them to take risks without thinking in certain situations. In this article we look at how the teenage brain develops, why young people sometimes make dangerous decisions, and what this knowledge can offer parents in terms of patience, setting limits and communication.
How Does the Teenage Brain Develop?
For many years it was thought that the brain developed largely in childhood and did not change much afterwards. With advances in brain imaging, it became clear that very extensive changes also take place in the brain during adolescence. This development continues until the mid-twenties.
The main changes in the brain during adolescence are:
Pruning: strengthening what is used
In childhood the brain produces far more nerve connections than it needs. In adolescence some of these connections are "pruned": frequently used connections are strengthened while unused ones weaken. This process allows the brain to work more efficiently. It also means that what the young person spends their time on in this period, such as music, sport, languages, reading or hours in front of a screen, influences the direction in which the brain is shaped.
Connections speeding up
Throughout adolescence, the insulating layer that speeds up communication between nerve cells gradually thickens. This process moves from the back regions of the brain towards the front. In other words, the "communication lines" between different regions of the brain are still under construction in adolescence.
The late maturing of the frontal regions
The regions at the front of the brain, which play a role in functions such as planning, impulse control, weighing up consequences, regulating emotions and long-term thinking, are among the last areas to finish maturing. These regions work as a kind of "executive centre". Like the conductor of an orchestra, they bring together information from different regions, set priorities and say "stop" when needed.
The early activation of the emotional and reward systems
By contrast, the brain regions involved in emotional reactions and seeking reward become highly active with the onset of puberty. Teenagers can be more sensitive to reward, novelty and excitement than both children and adults.
The Time Gap Between the Accelerator and the Brakes
There is an analogy often used to describe the teenage brain: in adolescence the brain's "accelerator" starts working at full power early on, but the "brakes" have not yet been fully fitted. While the emotional and reward-focused systems tell the young person "Go on, try it, it'll be exciting!", the systems that weigh consequences and rein in impulses cannot respond to that voice at the same speed.
This does not mean young people cannot think logically. When asked in a calm setting, without time pressure, young people can assess risks as well as adults can. They will most likely give the right answer to the question "Is it dangerous to get into a car driven by someone who has been drinking?" The problem is that this knowledge can be switched off in moments that are emotionally intense, exciting or require quick decisions.
In psychology this distinction is sometimes described as "cold" and "hot" cognitive states. In cold states, meaning calm moments with time to think, teenagers' decision-making skills are quite well developed. In hot states, meaning under excitement, anger, fear or peer pressure, the influence of the emotional systems increases markedly.
Why Does the Teenage Brain Take More Risks When Friends Are Around?
One of the most interesting features of the teenage brain is its response to the presence of peers. Research shows that there can be a marked difference between the decisions teenagers make when alone and those they make while their friends are watching. When friends are present, young people tend to take more risks; in adults this effect is much weaker.
The reason is that peer approval works as a powerful reward for the teenage brain. Being accepted within the group, being admired, and looking "brave" or "cool" can feel almost as strong as a physical need in this period. So a young person may do something with friends around that they would never do alone.
Let us say your fifteen-year-old daughter is walking around a shopping centre with her friends when someone in the group says, "Let's take something from that shop and walk out without paying; no one will notice." If you talked through this scenario at home on a calm evening, your daughter would most likely say it was wrong and risky. But in that moment, caught up in the group's excitement and the fear of being left out, making the same decision can be much harder. In a situation like this, having an escape line thought out in advance, such as being able to say "My mum's coming to pick me up in a minute, I have to go", makes things much easier for her. The same dynamic also operates with more serious risks such as substance use in teenagers.
The Positive Side of Risk-Taking
The teenage brain's inclination towards risk-taking is not only a source of danger. This feature is necessary for young people to separate from their family and build their own lives. Starting a new school, joining a team, going on stage, making new friends, standing up for an idea or going to university in another city all require taking some kind of risk.
The curiosity, search for novelty and courage of adolescence feed learning, creativity and independence. The aim is not to suppress the young person's tendency to take risks entirely, but to steer it towards safe and healthy areas. Sport, the performing arts, volunteering, outdoor activities, science projects or learning new skills are positive areas of risk that meet the young person's need for excitement. The thrill felt by a young person going on stage for the first time in a school play and the thrill felt by one riding downhill with no hands create a similar sense of reward in the brain; the difference is that one brings the young person skill and self-confidence while the other brings a risk of injury.
How Does the Teenage Brain Process Emotions?
In adolescence the brain may also work differently when interpreting other people's facial expressions and tones of voice. Some research suggests that young people may more readily perceive a neutral expression as anger or displeasure than adults do. This may be one of the reasons a parent's calm remark is heard by a teenager as "shouting". For example, when at the end of a tiring day you ask with a frown, "Have you tidied your room?", you may simply want information, while the young person perceives it as an accusation or anger and becomes defensive. Softening your tone, paying attention to your facial expression or starting the sentence with "I was just wondering" can make the same question land very differently.
Teenagers are also extremely sensitive to social evaluation. Embarrassment, exclusion and rejection can be felt more intensely in this period than by adults. This sensitivity helps young people develop social skills on the one hand, and increases their vulnerability on the other.
For a broader framework on the general developmental features of adolescence, have a look at our article on adolescence.
How Can Parents Use What We Know About the Teenage Brain?
Understanding the development of the teenage brain matters not in order to excuse every behaviour, but in order to guide young people more effectively.
Plan ahead for risky situations
Since young people can find it hard to make good decisions in hot moments, it helps to make decisions in calm moments. Talking through scenarios in advance, such as "What would you do if someone offered you a drink at a party?" or "If your friend has been drinking and is going to drive, how would you get home?", means the young person has a ready plan for that moment. Knowing that they can call you at any hour and be collected without being questioned is also an important safety net.
Take on the role of the "external brake", but let go gradually
Because the young person's own brakes are not yet fully developed, limits set by parents act as a kind of external brake in this period. Curfews, rules about driving, screen time and safety rules matter in this respect. But widening these limits gradually according to the young person's age and the responsibility they show gives them the chance to develop their own brakes.
Turn mistakes into learning opportunities
In this period the brain is shaped by experience. When a young person makes a mistake, thinking it through together with questions such as "What happened, what were you thinking at that moment, what could you do differently next time?" rather than only punishing them supports the brain in learning from the experience.
Don't argue in emotional moments
Trying to have a rational discussion when the young person is angry, upset or excited rarely works. Postponing important conversations until emotions have settled allows both of you to make a healthier assessment.
Create positive areas of risk
Supporting safe activities that meet the young person's need for excitement and novelty can reduce their interest in risky behaviour. Climbing, camping, theatre, team sports, competitions or volunteering projects can be a healthy response to this need.
Take sleep and nutrition seriously
Sleep is particularly important for a developing brain. In a sleep-deprived young person, impulse control weakens further and emotional reactions intensify. Regular sleep is one of the simplest yet most effective ways of supporting brain development.
The teenage brain is like a building site: noisy, messy and sometimes dangerous; but something new is being built there every day, and the parent is the scaffolding for that construction.
When Should You Seek Professional Support?
A certain degree of risk-taking and impulsivity is to be expected in adolescence. However, it may be helpful to get support from a professional in the following situations:
- Risky behaviours keep recurring and seriously threaten the safety of the young person or others
- There are signs of drug or alcohol use
- Impulsivity and attention problems are making school and social life markedly harder
- The young person seems to be using risky behaviour as a way of escaping emotional distress
- There are serious difficulties with anger control, violence or legal problems
- Risky behaviour comes with hopelessness, worthlessness or thoughts of self-harm
If there is a risk that the young person will harm themselves or someone else, or if there is a serious accident, poisoning or urgent safety situation, call 112 (emergency services) without delay.
How Are Teenagers' Risky Behaviours Addressed in Therapy?
Risky behaviours often emerge where developmental features, peer influence and emotional needs come together. In counselling for teenagers, these behaviours can be approached from different angles.
Decision-making skills: From a Cognitive Behavioural Therapy perspective, the thoughts that drive the young person in risky moments are examined. Thoughts such as "Nothing will happen to me" or "If I don't do it they'll call me a coward" are noticed and alternative perspectives are developed.
Emotional regulation: Skills that make it easier to stop and think in the face of intense emotions are worked on. Being able to put a small gap between impulse and action can prevent many risky decisions.
Peer relationships and being able to say no: Communication skills are worked on so that the young person can set boundaries while keeping their place in the group.
Understanding underlying needs: In some young people, risky behaviour may be less about seeking excitement than a way of escaping anxiety, unhappiness or tension within the family. Once these needs are recognised, healthier ways of meeting them can be sought.
Sessions with parents: With parents, setting limits suited to the young person's developmental level, creating safety plans and strengthening communication with the teenager are discussed.
Frequently Asked Questions
When is the teenage brain fully developed?
Brain development does not end with adolescence; in particular, the maturation of the frontal regions involved in planning and impulse control continues until the mid-twenties. This timing can vary from person to person.
Should I excuse my teenager's risky behaviour because "their brain isn't developed yet"?
No. Understanding brain development helps you grasp the reason for a behaviour, but it does not remove responsibility. This knowledge should be used to set more effective limits rather than simply punishing, and to offer the young person opportunities to learn.
What can be done to support the brain positively in adolescence?
Enough sleep, regular physical activity, learning experiences that spark curiosity, healthy relationships and opportunities for positive risk-taking support brain development. A secure bond with a parent is also a protective factor in this process.
How does screen use affect the teenage brain?
Screens offer fast, constant stimuli that appeal to the reward system. Excessive, uncontrolled use can have negative effects on sleep, attention and emotional regulation. Balanced use and making room for activities away from screens are important.
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Eda Erkan Alapala
Klinik Psikolog. İstanbul Kent Üniversitesi Klinik Psikoloji Tezli Yüksek Lisans mezunu; bilişsel davranışçı terapi, çocuk merkezli oyun terapisi ve çocuk-ergen psikoterapisi alanlarında eğitimlerini tamamlamıştır.
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