The first paragraph is describing how every experience we have is dependent on our sense of space. Evey thought we have is dependent on assigning a location to it. This is a statement about the way our brains work. I've seen that in my math classes where every abstract concept is seen as a change in position of a set of points in space.
It then goes on to describe how an injury to the brain can damage one's sense of position. The example they give is of someone with a brain injury who suddenly loses all his sense of the left-side. It's interesting how studies of a damaged sense can be used to examine how such a sense can be built in the first place.
There are also several kinds of spatial neglect. Egocentric neglect is unaware of space on one side of the body, allocentric neglect is unaware of space on one side of an object. Ok, so one's concept of space is a complicated operation. It can be damaged but the kind of spatial neglect caused from damage which itself depends on location within the brain.
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