Wrong. In addition to what I described about shock therapy, I also recently mentioned the much simpler notion of simply comparing brains between swoll and unswoll people (or rats?) during intensive workouts via. instrumentation, and then hypothesizing on any notable differences (in synapse activity). That alone will get about as "precise" a scientific result as I can think there to be, currently.
Compare them how? With what instruments? Notable differences?
There is, again, nothing testable here. And I write that as someone who rejects as utterly inadequate the conception of science as hypthesis testing (even in the Popperian 'disconfirmation' formulation). The most possibly-similar scientific approach here would be something like a Faraday empiricism where one creates phenomena, learns to create them consistently, then learns to manipulate them reliably, and then starts to draw conclusions about what must be going on in order for those phenomena to be and behave as instantiated.
But you don't even have that, since you don't have a phenomenon. You have a vague question: does 'swol' correlate with 'dumber'? You won't tell us what either term means in anything like a concrete way, and are both deliberate and offensive in your refusal to do so. You've squandered a resource here, and wasted a whole lot of other people's time.