The excitatory signals are pluses, the inhibitory ones are minuses.

兴奋性信号是加,抑制性信号则是减

耶鲁公开课 - 心理学导论课程节选

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

耶鲁公开课 - 心理学导论课程节选

Alcohol is inhibitory.

酒精是抑制性的

耶鲁公开课 - 心理学导论课程节选