but aren't our "intuitions" caused by the physical
processes going on in our brains? (not branes).
Intuition has a definite meaning as the sense we make of our perceptions. Sense perceptions fall into the category of aesthetics, or literally feelings. Imagination is what intuition gives us directly; fancy is images we make within ourselves beyond or in spite of intuition. Truth is entirely within, the relation between our intuition and imagination. As to what causes intuitions: it is sensory input. The brain seems to be in the neighborhood of these phenomena but the relation is not established.