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Long read, so very worth it. |
I was struck by this passage encountered one late night in Sapolsky's brilliant
Behave:
Chapter 6 discusses
experiments where a subject plays a game with two other people and is
manipulated into feeling that she is being left out. This activates her
amygdala, periaqueductal gray (that ancient brain region that helps process
physical pain), anterior cingulate, and insula, an anatomical picture of anger,
anxiety, pain, disgust, sadness. Soon afterward her PFC activates as
rationalizations kick in—“This is just a stupid game; I have friends; my dog
loves me.” And the amygdala et al. quiet down. And what if you do the same to
someone whose frontal cortex is not fully functional? The amygdala is
increasingly activated; the person feels increasingly distressed. What
neurological disease is involved? None. This is a typical teenager.
"Oh,
that's why, he's literally brain damaged," I thought to myself. Such terrific explanatory power, I could hardly wait to get to chapter
6 which, it turns out, is titled "ADOLESCENCE; OR, DUDE, WHERE’S MY FRONTAL CORTEX?" I found that so very helpful in explaining why you-know-who acts you-know-how that I'm sharing these many additional quotes with you, my parents of teenager readers:
…the
frontal cortex makes you do the harder thing when it’s the right thing to do…. The
frontal cortex is the last brain region to fully mature, with the most
evolutionarily recent subparts the very last. Amazingly, it’s not fully online
until people are in their midtwenties. You’d better bet this factoid will be
relevant to the chapter about adolescence.
All
this takes energy, and when it is working hard, the frontal cortex has an
extremely high metabolic rate and rates of activation of genes related to energy
production. Willpower is more than just a metaphor; self-control is a finite
resource.
Is resisting
lying a demanding task for your frontal cortex, or is it effortless habit? As
we’ll see, honesty often comes more easily thanks to automaticity.
If by
adolescence limbic, autonomic, and endocrine systems are going full blast while
the frontal cortex is still working out the assembly instructions, we’ve just
explained why adolescents are so frustrating, great, asinine, impulsive,
inspiring, destructive, self-destructive, selfless, selfish, impossible, and
world changing.
Older
teenagers experience emotions more intensely than do children or adults…. For example,
they are more reactive to faces expressing strong emotions.
So
adolescents take more risks and stink at risk assessment. But it’s not just
that teenagers are more willing to take risks. After all, adolescents and
adults don’t equally desire to do something risky and the adults simply don’t
do it because of their frontal cortical maturity. There is an age difference in
the sensations sought—adolescents are tempted to bungee jump; adults are
tempted to cheat on their low-salt diet.
Novelty
craving permeates adolescence; it is when we usually develop our stable tastes
in music, food, and fashion, with openness to novelty declining thereafter.
This
suggests that in adolescents strong rewards produce exaggerated dopaminergic
signaling, and nice sensible rewards for prudent actions feel lousy.
…adolescents
are more social and more complexly social than children or adults [and thus feel
a] frantic need to belong.
Rejection
hurts adolescents more, producing that stronger need to fit in.
An
open mind is a prerequisite for an open heart, and the adolescent hunger for
new experiences makes possible walking miles in lots of other people’s shoes.
Obviously,
the adolescent years are not just about organizing bake sales to fight global
warming. Late adolescence and early adulthood are when violence peaks, whether
premeditated or impulsive murder, Victorian fisticuffs or handguns, solitary or
organized (in or out of a uniform), focused on a stranger or on an intimate
partner. And then rates plummet. As has been said, the greatest crime-fighting
tool is a thirtieth birthday.
An
oft-repeated fact about adolescents is how “emotional intelligence” and “social
intelligence” predict adult success and happiness better than do IQ or SAT
scores. It’s all about social memory, emotional perspective taking, impulse
control, empathy, ability to work with others, self-regulation.
Heavy
childhood exposure to media violence predicts higher levels of aggression in
young adults of both sexes (“aggression” ranging from behavior in an
experimental setting to violent criminality)…. The link between exposure to
childhood media violence and increased adult aggression is stronger than the
link between lead exposure and IQ, calcium intake and bone mass, or asbestos
and laryngeal cancer.
Very helpful. And if you want a similarly telling explanation for why the rich (right) seem so puzzlingly unconcerned for the poor,
here's a bunch more quotes.