so, this is a big issue. Iâm going to try and break it down into a few vital points but Iâll probably miss some things.
first, thereâs the problem of science being poorly reported or even entirely misrepresented in popular media and in social discourse at large. a magazine called Parenting Science ran a great article about this in 2009. they used the example of a brain imaging study that had found teenagers showed more activity in the medial prefrontal cortex - the area of the brain associated with social decision making - than adults in certain situations. the scientists who did this study posited that this result might have something to do with teens having less social experience to draw on, and thus needing to think harder to understand subtle cues and predict othersâ behavior; or with the more flexible but less efficient neural networks that characterize young brains. but when it hit the popular press, this study was reported, incredibly, as âteen brains lack capacity for empathyâ. and not just in niche blogs or local rags - WebMD, MSNBC, and CBS all ran this story, saying that a study that had nothing to do with empathy whatsoever had scientifically proven that teenagers were less capable of caring about others than adults.
whatâs happening here is that science is being twisted in public consciousness to support pre-existing stereotypes of young people. this really isnât surprising if you study the history of science and society - any research about a group of people commonly treated as a cohesive social category will get misused to some extent.
next, thereâs the issue in both general public discourse and academia itself of going into research with biased framings. our culture approaches childhood with what you might call a âdeficit modelâ: any difference between young people and adults is taken to mean that adults are better. example: everyone knows teens think theyâre invincible and donât understand danger and thatâs why theyâre risk-takers, right? so we get year after year of research that aims to figure out exactly what part of the brain is responsible for that dangerous behavior, and never questions the underlying assumption. this study in the academic journal Nature turns this assumption on its head by saying teens arenât irresponsible and reckless, theyâre tolerant of ambiguity and uncertainty.
and really, this makes a lot more sense than thinking about it the other way. thereâs no reason the human race wouldâve evolved such that our brains have a diminished capacity to understand danger in the years before we procreate. whatâs the survival advantage of that?? but it makes a hell of a lot of sense that we wouldâve evolved such that in the early years of our independent lives, weâre more accepting of situations we canât predict or control. and in fact, this study in the Journal of Research on Adolescence (paywall) suggests something very much along these lines is at play: young people who engage in potentially hazardous âexploratory behaviorâ with their peers learn faster and show better performance on similar tasks later.
now, of course, that might still look like âriskyâ behavior from an objective outside point of view. but when a researcher starts out from the unbiased perspective of âhow do adolescents approach decision-making situations?â rather than the biased perspective of âwhy are teen brains so screwy?â, very different results emerge about the mechanisms behind age-related differences, and the potential value of those differences.
next, thereâs the fact that thereâs stuff about the young brain we just donât know yet, and some of it could have the potential to seriously change what supposedly settled science means. this study by researchers at Washington University in St Louis found that children and adults actually use different parts of the brain to perform the same tasks. specifically - this is the fascinating part - children tend to use more regions toward the back of their brains to do cognitive tasks that adults would tend to use more regions toward the front of their brains for. the lead scientist on the study specifically said this could be a way childrenâs brains compensate for the slow development of frontal regions.
now, this hasnât been explored specifically yet as far as I know, but what this could imply is that those studies that show less activity in âthe region of the brain associated with self-regulationâ might be effectively meaningless. if kids can do the same things with different parts of their brains compared to adults, maybe they donât need âfully-developedâ prefrontal cortices to do what adults rely on our fully-developed prefrontal cortices for.
thereâs also the fact that biology may be taking credit for what is, in fact, the province of culture and society. psychologist Robert Epstein wrote an article in Scientific American in which he attempted to remind us all that brain imaging studies are correlational, not causational; in other words, they canât say whether or not differences in brain structure and function are the cause of different behavior. and the relationship between emotions/experiences/behavior and the brain isnât a one-way street. the way we act, the way we feel, and what we see, hear, and do all change our brains in profound ways. âif teens are in turmoil,â Epstein says, âwe will necessarily find some corresponding chemical, electrical or anatomical properties in the brain. but did the brain cause the turmoil, or did the turmoil alter the brain?â
in other words, even if teenagers are categorically more reckless, more prone to destructive and criminal behavior, more likely to suffer mental illness, and even if teen brains are categorically different from adult brainsâŚwe donât have any solid data by which to blame the one on the other. it is just as likely, if not more likely, that the way our society treats young people (subjecting them to ten times as many restrictions on their behavior and experiences as the average adult and twice as many as incarcerated felons, Epstein points out) is the cause of this tumultuous adolescence, which in turn causes differences in brain function - rather than teen brains being naturally different, and that naturally causing teen turmoil.
the final point I want to make is that even when the science is relatively settled, how it gets perceived and interpreted in everyday thought and discourse is often the result of it being filtered through preexisting prejudices. as an example: there are things the young brain is better at. young childrenâs brains are (on average) superior to adolescent and adult brains in skill acquisition and sensorimotor processing. adolescent and young adult brains are superior in processing speed, short-term memory, and creative thinking. adult brains are superior in emotional regulation, executive functioning, and critical thinking. (I can find sources for these if anyone is curious, but they would all be different and I didnât want to be giving 6+ links in the middle of a paragraph.)
so why do we consider a brain âfully developedâ when itâs reached the peak of its executive function prowess, instead of the peak of its processing speed and creativity? because society, not science, says adults are âfully developedâ humans, and so any aspect of young brains which is superior is considered unimportant. we admit, quite freely, that young people are often more creative and better at learning - but we ultimately donât care. meanwhile, the aspects of cognition that happen to be stronger later in life get held up as marks of some sort of ineffable completeness.
to be honest, I would go so far as to say itâs completely impossible to actually understand age-based differences in human cognition within the current social framework of how we understand childhood and adulthood. I question at a base level whether unbiased scientific knowledge is even accessible in this kind of cultural climate. Iâm not saying research on this should all just stop, but we should start having the same conversations weâre having about research on the brain and gender, for example.
this is probably the longest post Iâve ever written on this site now, but science and society is such a fascinating topic for me generally, especially when it gets paired with social justice issues. I hope what Iâve written here make sense and is helpful in understanding why itâs so problematic to just boil everything down to âyour brain isnât fully formed until youâre 25âł. send me an ask if you want me to clarify anything!