They trigger intracellular biochemical events that eventually modify brain circuits that mediate the experience and memory of pleasure.

它们引起了细胞内的生物化学变化，并最终改变了大脑回路中对愉快的经历和记忆的反应方式。

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Neuroscientists have also identified unconscious memory systems that mediate emotional learning.

神经科学家也已经找到了调控情绪学习的无意识记忆系统。

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