You realize we are talking about neutrinos, by what mechanism could the human brain focus neutrinos?
The point is that focusing neutrinos is not the same thing as focusing photons...
The human brain does receive external energy, it's called chemical energy ie food... Human thoughts are made by the brain, they do not come from an outside source. I see no reason to suggest human thoughts come from an outside source...
No, neutrinos are not just a form of light, light is made of photons, photons interact with matter quite readily, neutrinos do not readily interact with matter, in fact they almost never do... Most researchers think neutrinos do have a tiny amount of mass...
I want to ask, Why do you think some sort of outside source is needed for thoughts to begin with?