very interesting topic i have had my conklin 7 string about a week now. my brain is just now adjusting fully. i found that my hands (the physical aspect) had no trouble adjusting to 7 strings (the ease of playability and quality of the instrument may be a factor here), but i found that my brain had a hard time thinking about 7 in regards to theory and such, however, after some major woodshedding and sightreading practice my brain caught on little by little, and now i pretty much have the hang of it physically & mentally. btw, i am a senior in high school and have always had the higher level maths. honors algebra, honors geo, honors precal, and now AP calculus. i guess math is my strong subject (though i have all honors classes in all subjects and make all as), though im not sure how much effect mathematical ability has on being able to handle a large number of strings as much as it effects general musical aptitude. i have heard numerous times through my high school career about how much better band students (such as myself) do in math, as music is very math oriented etc. i'd like to see a good study on this subject.