OK, just read the article...
"He wanted to find out why manufacturers and sellers are charging more for guitars made of "rare" woods."
He could have used his bluddy brain to figure that one out.
They are charging more for "rare" woods because "rare" wood costs more... duh!
This reported research will not even answer the question as stated in the article!!!
Pillock... (or the guy reporting it - it sounds to me that it's possibly the author of the article who's at fault here... let the poor guy do his paper, get his degree, etc)
As a guitarist, I would find the following research far more useful:
Two strats, both alder body, maple neck, rosewood board, both have had the same pickups at some point or other.
One of them I struggle to get enough top end out of it (I originally bought it because it has a nice rounded sound - but I don't always want that, I sometimes want more bite).
The other one sings like a bar-steward, cuts and bites and snarls, warbles and whispers. How do I get strat one to do that? Pickups don't do it, it's had five different sets in it. Bridge doesn't do it - changes of bridge did not change much, and they both have bridges made of the same guff now.
I'm left with three possible (drastic) changes:
Change frets
Change neck
Change body
Would be nice to know which bit to throw away, wouldn't it?
Funnily enough, play the two acoustically, not plugged in at all, and strat one sounds warm and round, not much bite. Strat two sounds bright, bouncy and cutting... and that's exactly what comes out when you plug the buggers in!! And messing with the electrics (including lots of lovely BKPs) DOES NOT CHANGE THIS DIFFERENCE between the two that I have been known to struggle with over the years. Yes, changing pickups does change the character of the individual guitar - but NOT enough to close the gap between the two guitars, never has... (much to my bitter disappointment a few years back)
I am prepared to believe it's the frets, not the woods. But that's going to be an expensive experiment that I can't afford at the moment. The bottom line, though, is I'm not prepared to change the neck or body - to me, it wouldn't be the same guitar any more.
BUT - I don't really care nowadays. I just accept them as they are and use them to their strengths... Although strat one can't do strat two, I've also realised that strat two can't do strat one. I actually want both sounds, I've just accepted I can't get both from the same guitar. I just have to make sure I'm wearing the right one. To use the wonderful analogy from earlier, when you want Paul Rodgers on a track, you wouldn't book Babs for the session, would you?
Of course, it could be the guitar straps. The mellow one has a leather strap, and the bright one a webbing strap.
I'm with Wez and others - every single bit of the system affects what comes out of it. I strongly suspect that this chap is going to do fine work and get his degree. But I also suspect he won't have access to sensitive enough equipment and controlled enough environments to be able to measure some of the variables. My suspicion is that he won't have enough data to be able to make any claims one way or the other - certainly not strong enough claims to be able to bash any guitar manufacturers (like it felt to me the author of the article wants to be able to do).