But the brain must convert the stimulus into some presentation that consciousness can experience.
Well there you go again, missing what I wrote.
First problem for you is to read, then understand what is written.
But I'll simplify by repeating myself in untermenche form:
Neuroans have evolved to provide information about boundaries.
Brain structures have evolved to define and compare these structures,
Memory has evolved to store these findings.
And interpretation processes have evolved to compare and contrast all of this.
Decision processes have evolved to sort among what is sensed and what is stored =ab out what is sensed. And all of this has evolved under pressure for remaining a living thing by optimizing each of these above activities and structure for being useful enough that the organism reproduces and passes on information about how all this is put together and used.
At the same time movement and manipulation attributes have evolved to move the organisms and to permit it to exploit the environment about it. These functions are controlled by a descending nervous system used to control the evolved movers and manipulators.
All of this has taken place under rules which limit outcomes to those individuals that exploit the environment most effectively (are best at finding, hunting, gathering, mating, and learning).
That an organism is aware of what it is doing and about to do comes from development of superior species and within species tools with which to do all the above. As
bilby points out it is enough for one to know organisms have the capability to structure what is sensed into usable arrays to produce the fact of existence of shape and usability experiences. There need be no Maezel deciding because the organism is performing those evolved functions. Who's to say what the Manta experiences. It has the capacity to sense and make use of that it senses and we know the mechanics and dynamics of these processes. That we believe we are conscious and we are using it to decide what we do and to what we care to respond is our own private convenient fiction.
But it is clear the processes and capabilities exist within us to do all these things and we understand how most of these processes work, where they are can be revealed to be working, and how outcomes are attained from us using these capabilities.
Information is organized by nervous processing of sensed data that is wired in and modified with repeated exposure. Output from organisms arise from coordinating activity produced to move and manipulate movement and appendage that is wired and modified by repeated action. How it is done has little to do with what we experience beyond what what is done produces evidence of experience which are globally accessible by our senses. Our conscious experience is no more than a history of accessible elements which we can exploit in rehearsal and speech.