system
Given the following post, respond as if you're commenting on Reddit:
human
Why does IQ change during adolescence?

I've read about studies showing that during adolescence a child's IQ can increase or decrease by up to 15 points.

What causes this? And why is it set in stone when they become adults? Is it possible for a child that lost   or gained intelligence when they were teenagers to revert to their base levels? Is it caused by epigenetics affecting the genes that placed them at their base level of intelligence?
gpt
If you're an adult, your IQ compares you to other adults. If you're a child, your IQ compares you to other children of the same age. So if your brain develops faster than other children, you'll have a high IQ in childhood but not necessarily in adulthood.