While touring a local book store, I happened upon the October 2011 edition of National Geographic - “The New Science of the Teenage Brain”. As an high school educator, it peaked my interest immensely, and so I grabbed it (and paid – of course), feverishly reading through the article on the latest research on the neurology of that dark abyss of perplexity we parents and high school teachers fondly refer to as the teenage mind. I must say, David Dobbs’ research and insight left me dumbfounded and so I felt so compelled to share what I read that I decided to write a brief synopsis of its content for my colleagues. Since I seldom have the chance to make blog posts, I opportunistically decided to kill two birds with one stone by posting it here. I hope it’ll be interesting enough to get you to go and buy it today. If you’re a parent, teacher, coach or anyone who actively interacts with teenagers, this is the article for you. Yes, some of it we already knew by experience. What’s different here is that it really explains in scientifically clear terms why teenagers think and behave the way they do. From this, depending on the capacity in which you interact with teens, you’ll be able to adjust how you guide, correct, discipline and relate to them. A truly enjoyable article…
THE TRUTH ABOUT THE TEENAGE BRAIN
A report on key observations and findings in “Beautiful Brains” by David Dobbs as published in the October 2011 edition of National Geographic
ADOLESCENCE – SEPARATING FACT FROM FICTION
FICTION
i. The adolescent brain is similar to earlier
evolutionary/developmental stages of the human brain.
ii. Teens do not weigh the risks involved in their actions.
iii. Teenagers are idiotic and impulsive.
iv. Teenagers lack discipline and focus – they are too easily
distracted
v. Teenagers are inconsistent.
FACT
i. The adolescent brain represents the highest stage of human
adaptability.
ii. Teens and adults have the same degree of risk awareness,
but teenagers find potential rewards more appealing.
iii. Teenagers are not foolishly impulsive. In adolescence, the
brain’s most developed processing areas prioritise impulsive
decision-making
iv. Teenagers are very focused and disciplined when
incentives are adequate. The problem is that they’re naturally
drawn to “novelty” – anything new or different. They’re
instinctively indifferent to familiar things and experiences.
v. Teenagers are not inconsistent – they are flexible.
THE BIOLOGY BEHIND THESE CONCLUSIONS
The first extensive neurological scans conducted in the 90s demonstrated that, contrary to previous thought, the human brain continues to develop significantly during adolescence, completing its maturation by around age 25. 90% of the brain’s growth is complete by age 6. It is in the course of adolescence that the brain specialises through extensive remodelling.
This remodelling involves a number of changes:
a. The brain’s axons, the long nerve fibres that neurons use to send signals to other neurons, gradually become insulated with myelin (the brain’s white matter), a fatty substance that maximises axon transmission speed by up to 100 times.
b. The brain’s dendrites, the branching extensions that neurons use to receive signals from axons, branch more and the synapses (the chemical structures that allow the axons and dendrites to pass information) become richer and stronger.
c. During this increased branching and accelerated information sharing, the unused synapses wither. This process of discarding unused synapses thins the outer grey layer of the brain, the cortex – which is used for conscious and complex thought. This thinner cortex is more efficient.
These modifications make the brain not only faster, but more sophisticated.
d. This developmental process moves slowly in waves from the rear of the brain (where more behaviourally fundamental processing
occurs such as vision and movement) to the front (where complex thinking occurs).
e. The corpus callosum (or bridge between right and left hemispheres of the brain) gradually thickens.
f. Stronger connections develop between the hippocampus (a memory log of sorts) and the frontal areas that are used for setting goals
and prioritising targets.
g. During these adjustments, the teen brain is much more responsive to pleasure by having a heightened sensitivity to dopamine – a hormone that heightens the appreciation of reward and facilitates the fast learning competence of teens. It also contributes to his/her
apparent melodramatic reactions to success and failure.
h. The teen brain is also highly sensitive to oxytocin, the neural hormone makes social connections more special and more rewarding. When these two neural hormones actively intersect (as is the case in adolescence) it makes everything feel and appear more intense.
These combined developments integrate memory and experience into the decision-making process which then enable the thinker to weigh variables more effectively than before.
THE MANIFESTATION OF THIS REAR-CENTRED AND ADAPTABLE, NOVELTY-ORIENTED TEEN BRAIN
- Teens love “thrills” – They will take risks, however absurd, for pleasure and heightened sensations.
- Teens enjoy the company of their peers – They are naturally attracted to their own age group because they find other teens more adept at offering “new” experiences.
- Teens challenge each other with dares and implicit rites of passage – These can take healthy forms like sports, dance or academic performance or unhealthy forms like sex, recklessness and drug abuse.
- Teens are more likely to take risks and act on impulse among their peers – Peer pressure, even in silence, is very real. However, beyond this, it also prepares them “to invest in the future rather than the past. We enter a world made by our parents. But we will live most of our lives, and prosper (or not) in a world remade by our peers” (p. 55). Essentially, although born into and raised in the world of their parents, they will live in the world remade by their generation. Peer-exclusive interaction and the desire to please, impress and challenge one’s adolescent peers establishes pecking orders and hones skills that will be useful in adult life within their generation.
QUOTE FOR REFLECTION: “ When this development proceeds normally, we get better at balancing impulse, desire, goals, self-interest, rules, ethics, and even altruism, generating behaviour that is more complex and, sometimes at least, more sensible. But at times, and especially at first, the brain does this work clumsily. It’s hard to get all those new cogs to mesh” (p. 48).
CONCLUSION 1: This is an on-going developmental process which means that, from time to time, and more often than not – depending on external factors – the very best teenagers, and particularly the youngest among them, will stumble neurologically just as they do physically in their new pubescent bodies.
CONCLUSION 2: Due to the late completion of myelination, the brain is able to wait until the average age of home-leaving to finalise the characteristics, propensities and processing priorities until the adolescent (now turned adult) is ready to truly enter the adult world with all the accompanying challenges s/he will face.
CONCLUSION 3: Once myelination is finalised, what you see is what you get and it will be very difficult for that individual to change – THEREFORE, TRAINING AND CHARACTER DEVELOPMENT DURING ADOLESCENCE IS CRITICAL FOR PROFESSIONAL AND SOCIAL SUCCESS IN ADULT LIFE.
IMPLICATIONS FOR THE CLASSROOM AND SCHOOL LIFE
- Teen brains are attracted to novelty – Lessons must be dynamic, highly creative and rich in variety – incorporating a range of presentation styles and activities.
- Teen brains are reward/pleasure sensitive – Teachers must explicitly encourage student academic effort by offering teen-appropriate incentives – trips, social gatherings, privileges, public recognition and so on.
- Teen brains are unspecialised, but in the process of becoming highly specialised – Emphasis should be placed on cultural and intellectual exposure to provide the brain with stimuli that will allow it to establish its own talents and areas of interest.
- Teen brains are more profoundly impacted by emotion – Accommodations must be made for the melodrama in their lives. What may seem minor to adults can actually feel catastrophic to them: a break-up, rumours, embarrassment. Similarly, positive emotions can feel beyond ecstatic: affection, joy and excitement.
- Teen brains are prone to seemingly reckless decision-making and readily challenging authority – Classroom management, discipline and social guidance are CRITICAL in order to establish favourable reflexes, sensibilities and general conduct in teens. Left unmanaged, teens can become VOLATILE.
- Teen brains are in rapid evolution and are therefore be unreliable – Forgive them when they stumble. Just remember to make them always aware of what you expect and what you believe they can achieve. Be firm, but gentle when possible and allow them some margin of latitude to negotiate this difficult transition to adulthood.
QUOTE FOR REFLECTION: “Adults can guide teens as conductors, coaches, and cheerleaders. You just have to know when to pull back and let the teen do the work.” – B. J. Casey, Neuroscientist.



























