当图象消失了，因为不确定该往哪看，上视丘神经活动会出现起伏现象，引起微眼跳。
When images begin to fade, the uncertainty about where to look increases the fluctuations in superior colliculus activity, triggering a microsaccade.
嗜睡症似乎是由基因遗传导致的，该遗传会是人体无法吸收或产生足够的神经下视丘分泌素。
Narcolepsy is apparently caused by a genetic glitch that prevents the body from either absorbing or producing enough of the neurochemical hypocretin.
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