stimulation和 stimulus 区别

stimulation和 stimulus 区别
看到过下面的解释,谁能用中文切中要害的解释出最显著的区别?
名词stimulation:n. 刺激,激励,鼓舞
1. the act of arousing an organism to action
2. any stimulating information or event; acts to arouse action
同义词：stimulus, stimulant, input
3. (physiology) the effect of a stimulus (on nerves or organs etc.)
4. mutual sexual fondling prior to sexual intercourse
名词stimulus:
n. 刺激,激励,刺激品
any stimulating information or event; acts to arouse action
同义词：stimulation, stimulant, input