尽管其他皮质永久丧失，爬行动物的大脑仍在自动运行。
The reptilian brain is functioning on autopilot despite the permanent loss of other cortexes.
早期的时日漂浮在羊水中度过，感觉官能缺乏，新生动物的躯体感觉皮质发生变化的时机已经成熟。
Having spent the prior weeks with the senses deprived while afloat in amniotic fluid, a newborn animal's somatosensory cortex is ripe for change.
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).
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