Researchers from the University of Auckland New Zealand, have discovered a link between Alcohol and Brain Function. It has been proven that a measured "dose" of alcohol a day can "heightened cognition" in lab rats.
The rats were split into 3 groups. The first was given the rat equivalent of 6 pints a day, the second, only a few drinks (the equivalent to keep someone just under the drink drive limit) and finally the third unlucky group was Tea Total (No Alcohol).
It turns out that through the use of several tests, but most notably a black electric pad in their cage, the rats that had consumed a few drinks a day learned very quickly not to walk on the pad, unlike the tea-totallers and booze-hounds.