the fact of two or more people causing each other to become more active or enthusiastic

The observers noted that there was vigorous interstimulation among the students. 观察者们注意到学生们之间存在着强烈的相互激励。

There was a strong attachment and interstimulation between staff and students. 教职员和学生之间感情融洽，互相鼓励，互相帮助。