How can we know that we experience sensations as a series of discrete sensations?

I'm currently reading the book "Mastering the Core Teachings of the Buddha" by Daniel Ingram, and he insists over and over that the continuity of sensations is an illusion, and that sensations actually come to us in a sort of flickering. I've done some meditation and have started to feel what he is talking about. But if we can detect the gaps in between the sensations, isn't the detection of the gaps itself a sensation? How do we know that the experience of flickering isn't the illusion, and that the reality is a continuous stream of sensations?