i find scientific assessments tend to lean towards having to be right to justify themselves.
its your imagination that needs firing that no-one can just give to you or swap for cash.
if you havent been playing guitar for very long ..,., like 6 yrs or less , then no amount of tests can prove whether you will suddenly click it all into place and build up the confidence to believe in yourself.
it is possible to make your own scientific analysis of music .
first you have to learn the theory and the techniques thoroughly before applying them to your playing.
the reality is that you need encouragement in your playing of music , so hanging out with the right sort of people , will bring another side of you out.
i guess i should add that music is in itself a science anyway - of the mathematical kind.
in a song you have a basic beat which could be divided into 4/4 , which is a fraction .
each beat can then be divided into however the musician want the music to feel .
to say that you could start with a bend and then add a triplet at the end is ok to start with , but i think that in the end , its about using all the theoretical knowledge and appying it in an offhand sort of way - ie feeling that you want to chuck a
slide , sustain a note etc !
but its all in the practise and i would need pages upon pages to describe fully what im saying !