Rom; And bear in mind all this is simply a proxy for blood flow in the brain. > > > > David: I've pointed this out all along. How many steps removed from reality? the brain is too complex to conclude that blood flow studies tell us much. > >Rom: And yet we can get surprisingly good images from the blood flow?-It is like apples and oranges. We need to know neuron function and connections, and we are looking at fuel supply. Can't infer very much!