Essentialism and the default mode network

Appendix D endnote 19, from How Emotions are Made: The Secret Life of the Brain by Lisa Feldman Barrett.
Some context is:

A second essentialist misconception is that your default mode network has a single set of neurons for each goal, like little essences,...

In fact, many scientists and philosophers traditionally think of the relationships between sensation, perception, and concepts as linear. In this view, sensory changes, which are highly variable, lead to perception, which is stable and concrete, which leads to a so-called “abstract concept”; and each of these three parts is stored in its own part of the brain. This fits nicely with the (mistaken) assumption that the brain works by an elaborated stimulus → response logic (i.e., a stimulus triggers sensation, which becomes perception, and then cognition, triggering a response).