Which, is when the brain really starts picking up on weird signals, eh?
Detecting or generating. You seem to have a consistent problem making that distinction. Hallucinations are generated within the visual cortex without signals from the eye. The brain is capable of generating a lot on its own.
The brain is what channels consciousness ... as pertains to our spirit and/or soul.
Based on what? How do you know the brain "channels" consciousness as oopose to generates consciousness. If it was a channel, then consciousness comes from some other source than the brain, and should be detectable by means other than a brain outside of the brain.
You are trying to make the brain be a "processor" only, incapable of generating the senses, much less the sense of "self". Hence, the sense of self, in your mind, must come from some other place, just like an image comes from the eyes.
But ask yourself, is a person who is blind their entire lives able to form a mental image even though their eyes have never sent a single image to the brain? The answer is: yes they can, thanks to various parts within the cerebral cortex and the ability to detect external stimuli through hearing and feeling. They can still "see" in their minds, forming maps, mental constructs and models.
The sense of self or consciousness is mostly routed in the thalmus. Damage to the thalmus can create a loss of sense of one's self. Persistent vegitative state studies have shown that enough damage to the thalmus (with even 0% damage to the cerebral cortex) can render a human into a living vegetable, capable of detecting and processing external signals but with no definable conscious.
Consciousness has been shown to require communication between the thalmus and the cerebral cortex. In other words, consciousness requires some information from external senses into order to form a definition of self. The brain (thalmus) defines self based on external/processed signals (cortex).
Consciousness is GENERATED. Don't believe me? Read a neuroscience textbook on the thalmus and cerebral cortex.
If you want to convince me that it is channeled, I'd like to know where the evidence is.