I have heard that "90% of information flow in the brain (or maybe it was just the visual cortex) is top-down". I'm not sure if this claim is substantiated, but I do get the impression that there is strong evidence that at least most of the information flow is top-down. I'd like to know as specifically as possible what current theories in neuroscience say is going on here. I'd appreciate details and reputable academic works.
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No the brain doesn't in practice work in a single flow. It takes a combination of top-down and bottom-up at various frequencies to perform any task. Outside a laboratory the amount of time you spend going top-down or bottom-up will depend on what kind of life you lead.