I personally believe that we can pick up a greater frequency range while high. And I think sounds are amplified too.
I love riding with my friend when I'm stoned. He has a sound system in his car that vibrates the seats, and I swear I can feel my hair move around on my scalp. It's amazing.
I get ninja nose. A while back I went to my friends house and when I entered the neighborhood I already knew they were smoking. Maybe it's only for the sweet ganja though I'm not sure.
Yea one time I got so high while wearing a hoody that the second I turned my head I had to pull a 180 because I thought someone was sneaking up on me, it was just my hair rubbing on hoody. I dont know about hearing sounds better, just being more alert to them. Then again, MJ's effects are subjective.
I hate that shit, Ill be the only one home and think im hearing other people in the house and the tvs off,