Hi Lauren April

I would say, if one area has been under-researched, that area would be the skin.
I find that many of us know too little about what the reactions of our body are to being touched ( by massage, electricity, sonor etc). We, most of us are still hands-on professionals, work with the skin all day, and we know so little about it......

I agree with Gcoe that you definitely have to feel at least a bit "extremely" interested in whatever you choose.

Good luck with your choice

Esther