The arrows indicate peak gray matter volume in prefrontal cortex. You can see that that peak happens a couple of years later in boys relative to girls, and that's probably because boys go through puberty a couple of years later than girls on average, and then during adolescence, there's a significant decline in gray matter volume in prefrontal cortex.
箭头指的就是大脑灰质在前额叶皮层 达到的锋点，你会发现要达到这个锋点 男孩会相对比女孩要慢几年 这大概是因为男孩平均要比女孩 晚那么几年经历青春期 在青春期阶段，大脑灰质