One more bit that seemed important: His laboratory has found evidence that Alzheimer’s disease stems from an imbalance in nerve cell signaling: in the normal b

One more bit that seemed important: His laboratory has found evidence that Alzheimer’s disease stems from an imbalance in nerve cell signaling: in the normal brain, specific signals foster nerve connections and memory making, while balancing signals support memory loss, allowing irrelevant information to be forgotten. But in Alzheimer’s disease, the balance of these opposing signals is disturbed, nerve connections are suppressed, and memories are lost. This is a theory that I hadn't heard before, but it makes sense. I'm wondering if this signaling imbalance is something that could discovered in a test or scan, and if so, how early?