They use their natural sense to do something instead of their learned knowledge.

VOA: special.2010.05.02

It's as if his knowledge of his own conception, his own birth, his own babyhood, is a natural knowledge.

好像他很自然地知道自己是胚胎时的故事，知道自己如何出生以及自己的童年。

耶鲁公开课 - 1945年后的美国小说课程节选