很多年来，科学家们认为大脑的视交叉上核(scn)是生物钟中枢，具体机制是此处的神经元白天比夜间更兴奋。
For years, scientists thought that neurons in the brain's suprachiasmatic nuclei, or SCN, regulated our body clocks by firing a lot during the day and less at night.
中枢神经系统兴奋性和抑制性的失平衡被认为是耳鸣产生的候选机制。
The auditory system requires a delicate balance between inhibition and excitation for normal auditory perception.
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