他们发现毒蕈碱能刺激神经兴奋，并引起八目鳗运动。

Their work determined that muscarine stimulated neural activity, leading to locomotion in the laboratory lampreys.

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咖啡因可以作为兴奋剂，可可碱会刺激心肌和神经系统，而phenyethylamine（至今尚未有确凿的证据证明其存在）号称是情绪电梯和抗抑郁剂。

Theobromine stimulates the heart muscle and the nervous system. And phenyethylamine is reputed (no conclusive proof exists yet) to be a mood elevator and an anti-depressant.

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根据佛罗里达中心大学(UCF)心理学家马克·拉柏特里的研究，孩子纽动或摇摆身体，很可能是孩子们在面对晦涩无趣的作业时，用来刺激维持自己大脑皮层、尤其是他们内部存储神经兴奋的一种方式。

According to psychologist Mark Rapport of UCF, squirming and fidgeting can be a way children maintain their cortical arousal — especially their working memory — when faced with a dull task.

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Now, these signals can be either excitatory, which is that they raise the likelihood the neuron will fire, or inhibitory in that they lower the likelihood that the neuron will fire.

这些刺激信号可能是兴奋性的,会增加神经元产生神经冲动可能性,也可能是抑制性的,会降低神经元产生神经冲动的可能性

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