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

独特而深深的由沟回组成的表面是大脑皮层，它组成灰质。

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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.

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。

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The outer layer of the cerebrum is called the cortex (also known as "gray matter").

大脑外层叫做皮质(也称“灰质”)。

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" And that both of these features are well predicted by the volume of gray matter in two specific regions of the prefrontal cortex, regions that are known to be important in "decoupling the perspectives of other people from one's own.

WSJ: The Social Network and the Dunbar Number | Mind & Matter

Liars, it turned out, had 14% less gray matter than the controls but had 22-26% more white matter in the prefrontal cortex, suggesting that they were more likely to make connections between different memories and ideas as increased connectivity means greater access to the reserve of associations and memories stored in gray matter.

FORBES: Do Liars Really Have Different Brains?