英语翻译The demanding part nothing when the two stimuli matched

The demanding part （加上谓语）involved noting when the two stimuli matched what had occurred two or even three steps earlier in the sequence。
在两种刺激匹配在更早的序列中的两个甚至三个步骤时所发生的刺激时,所要求的部分什么都没涉及。