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This idea, new to me, that we're at the mercy of luck and happenstances during our years of adolescent brain development, explains a little about the complicated process going on, about 13 years for girls and 14 years for boys. If we don't get a love of serious music in those years, we might develop a love later but it will be different and probably less intense, because the brain chemicals have already done their developmental work. It’s over (the blank slate of youth) for that person..Now it's back to the most boring meta-level about which posters write worse blanket dismissals of whole periods or styles? What's the point?
The amygdala is responsible for immediate reactions including fear and flight-or-fight behavior (apparently this is important so young - for survival). This region develops early, but the frontal cortex develops later. And this part of the brain, which does the logical thinking before we act, is still changing and maturing well into adulthood.
Also, during adolescence a rapid increase in the connections between the brain cells and making the pathways more effective enhances every sensory experience. The myelin continues to fill in to become an insulating layer that helps cells communicate.
All these changes give us a more vibrant experience when experiencing music in those years, and then it gets all mixed up with identity, sexuality, approval from our peers etc.
Pictures of the brain in action show that adolescents' brains work differently than adults when they make decisions or solve problems.
So apparently as we're latching on to our favorite types of music, it's not a thinking process, but it's more akin to a developing instinct, like apprehension at the sound of a rattlesnake or a lion roaring.
Ah music, it's a deep subject.