IMO, from a scientific point of view, i think its possible they misinterpreted the results. maybe the people who were better at keeping a beat scored better because they are just used to keeping a beat and doing other things at the same time (talking,listening, etc). so it may be a matter of practice, not natural occurance. just like when i first started driving id have a hard time doing other things, but now i can drive, text, listen to music (if i had a radio), etc at the same time without a hitch. but it doesnt make me anymore of an intellectual. just my perspective, not trying to take anything away from you drummers or this one study. you cant draw wild conclusions from just one study IMO.