Neurons and electrical impulses? I don't think so. I think consciousness exists at a higher level than neurons and electrical impulses. For an example, if the algorithms that our brains use to create thoughts could be simulated on a different substrate, it could be possible to create a consciousness through means different from neurons and electical impulses. Maybe doesn't even have to be electrical. If you could use light or photons for manipulating logic gates, that might be feasible too. The point: consciousness isn't the substrate; it's the PATTERN.