[cmeranda]

I have to wonder if training and repetition might make a difference there; for instance, after a week of doing computations while walking, can your friend now multiply faster? The mind is an efficient adapter. It would also be interesting to discover what qualifies as exercise in those studies, and if the benefits of increased circulation and possibly a clearer airway based on improved posture, which presumably also increase brain function, could offset the glucose depletion.