Here is an article on something I've been thinking about during these discussions:
http://sciam.com/print_version.cfm?articleID=0007D716-71A1-1179-AF8683414B7F0000 All music is, essentially psychoacoustic neuro-technology. While not all musicians use technical equipment to measure effects in terms of brainwave activity, they do use a more organic method (namely an acute awareness of their own reactions and the reactions of others) for their testing.
