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If practice can improve it, I am sure there are. Actually, wonder if Ritalin works this way for treatment of ADHD. Wikipedia says: "It produces such effects as increasing or maintaining alertness, combating fatigue, and improving attention."
Maybe it combats ego fatigue as well. This title suggests it might help rats deal with cravings for blow while they are thinking: http://www.ncbi.nlm.nih.gov/pubmed/21116260 :) aside: Why 'Ulysses' and not 'Odysseus'?