独特而深深的由沟回组成的表面是大脑皮层，它组成灰质。

The distinctive, deeply wrinkled outer surface is the cerebral cortex, which consists of gray matter.

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我们称之为突触的自我修剪，保持意识清醒和用来复杂思维的大脑皮层，外面的灰质外层变得更薄但更高效。

This synaptic pruning, as it is called, causes the brain's cortex-the outer layer of gray matter where we do much of our conscious and complicated thinking-to become thinner but more efficient.

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一组磁共振成像主要关注大脑褶皱层或者脑皮层上的灰质组织，这些组织是用来处理记忆、情绪、演讲、视觉、听力和电动机操作的地方。

One set of MRI images focused on grey matter at the brain's wrinkled surface, or cortex, where the processing of memory, emotions, speech, sight, hearing and motor control occurs.

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