"The population, not only in the United States, but worldwide, of older people is increasing," said Buckholtz.

世界各地，不仅仅是美国，老年人口都在增长。

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"Our best guess is that perhaps there's some inherited or environmentally mediated predisposition to having lower midbrain dopamine autoreceptor availability," Buckholtz says.

“我们猜测可能是某些遗传或环境因素综合作用促成这种倾向，降低了中脑内多巴胺受体的活性。”Buckholtz解释。

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