Interesting - I've read of vasopressin delivered intranasally (nose spray type delivery) is supposed to have almost immediate effects sharpening attention, focus, and memory. I've got a few books on Smart Drugs I bought back in college 20 years ago or so, so the info is dated now but much of it was actually done by the military so there was a definite focus on what gave results.
I haven't done any research on vasopressin in 20 years, but it may be something to look into. Just rang a bell for some reason.