Thought generally represents the abstract perspective of our hyper-dimensional universe.
For example, every object around us is made of bits of matter that have fundamental values like mass and velocity.
However, where did that object come from? Who made it? What is its value? What is its function?
The answers to these questions are held within the abstract perspective of the Universe. Knowing these answers requires knowing about the invisible relationships that unite objects in space and time.
Mathematics are built entirely on collections of intricate symbols.
When someone is thinking, their minds are moving across a massive network of relationships, interconnecting symbols.
A thought is reflective of some vector across this network of relationships, and its chemical manifestation in the brain is the vector's most basic physical reflection.
Therefore thoughts, like any other manifestation, will appear in both abstract and physical forms simultaneously, because we inhabit a hyperdimensional Universe.