As the brain matures, experience prunes excess neural connections while strengthening those that are more commonly used. Many scientists believe that this process contributes to a steady reduction in gray matter volume during adolescence. Because environmental forces help determine which connections will wither and which connections will thrive, brain circuits that emerge become more efficient, however, this is a process that can be cut in both directions. Because not all behavioral patterns are desirable or healthy. An environment with negative factors can lead to effective but potentially harmful circuits that harm a person's well-being. So when you feel unhappy, you may just be growing parts of your brain that you didn't have before.
随着大脑的成熟，经验会修剪多余的神经连接，同时加强那些更常用的神经连接。许多科学家认为这过程有助于青春期灰质体积的稳定减少。由于环境力量有助于确定哪些连接会枯萎，哪些连接会茁壮成长出现的大脑回路变得更高的效率，然而，这是一个可以双向切割的过程。因为井非所有的行为模式都是可取的或健康的。具有负面因素的环境有可能导致有效但可能有害的回路，从而损害到一个人的福祉。所以觉得不开心时，也许只是大脑在长出原来没有的部分。
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