I think that what he wants to say that is difficult to locate the "now", if you read a little more he explains it more clearly. "the quickest neural processes

I think that what he wants to say that is difficult to locate the "now", if you read a little more he explains it more clearly. "the quickest neural processes still require tens of milliseconds to complete as electronic and chemical signals travel back and forth across the meters of neural circuitry packed in our brains. So even for the neuroscientists the physical stuff that they view as constituting our conscious experience is spread over space and time, albeit tiny spaces. In fact, if we wanted to be really rigorous and consider only what is present at one instant in time, the world as we know it would disappear. Sounds, light, voices, gestures, actions, words, all require a flexible notion of nowness that encompasses more than a single instant."