Instead,the studies ended up giving their name to the"Hawthorn effect",the extremely influential idea that the very act of being experimented upon changed subjects' behavior. 请问这里面act的后置定语为何用了of加动名词being experimented而不直接把of省略用目前分词being experimented结构，谢谢！
网友如此提问，说明对目前分词作定语和 of + 动名词作定语，觉得等同，且混淆在一块，很大地误解了它们各自有哪些用途。
the act of being experimented upon：说明，being experimented upon 与 the act 是同位关系。“（人或物）被做实验” = “这个行为”。
the act being experimented upon：说明，the act 是 “做实验” 动作的同意者。act 是一个抽象意义的名词，不是人，更不是具体的物，它如何能被实验呢？逻辑不通，错误。