Hi isolatex, this one is difficult
Good old piracetam is reported to increase information flow between both hemispheres. I think there is only one study on this.
Also many people find that the experience of music is enchanced under piracetam, so maybe there is a basis to think it acts on perception.
Sulbutiamine acts on the cerebellum (the equilibrium organ among other things) and improves coordination. The literature is better than the user reports for this drug, but I consider it interesting although I did not felt much from it.
Chez l'animal amélioration de la résistance à la fatigue musculaire et à la coordination motrice
http://www2.biam2.org/www/Spe2753.htmlSulbutiamine increases physical resistance to fatigue, neuromuscular efficiency and learning and memory; and improves the metabolic functions of the cerebral cortex.
http://www.medmart.w...arcalion200.htmPrecision movements are dependant on dopamine (lack of dopamine=tremors like you see in parkinson´s)
So you may consider some dopamine enhancing drugs like deprenyl, bromocriptine, etc. But if you are young I do not think it will make a noticeable difference YMMV.
Too much cholinergics and you get muscle tension.