它来源于对大脑的反馈回路的强烈刺激——古老的“哺乳动物大脑”的一部分，它位于大脑新皮质之下。
It arises from intense stimulation of the reward circuitry of the brain — a portion of the ancient "mammalian brain," which lies under the newer neocortex (rational brain).
现在人们已经发现，处理恐惧的大脑回路——也就是杏仁核——比负责推理和执行控制的额前皮质要提前发育很多。
It turns out that the brain circuit for processing fear - the amygdala - is precocious and develops way ahead of the prefrontal cortex, the seat of reasoning and executive control.
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