head high... you feel it mostly in your head... sativa is usually accompanied by a very uppity hyper high... you don't feel lazy, you actually feel like gettign up and doing stuff... anything just to keep busy and moving... seems to fuck with your sight alot for me too...

body stone, you feel it in yoru body.. often refered to as 'couch lock' where you're so lazy and stoned you don't want to do anything but sit on the couch... everything takes ridiculous ammounts of effort to do because you feel so down and lazy... you do'nt feel it in you rhead awhole lot... but if you close your eyes (again for me atleast) you tend to have some pretty weird 'feelings' (body trips) can feel like your floating or spinning, but not like drunk sick spinning... it's actually fun....

in short... if you feel upity and hyper, it's probably sativa dominant.. if you feel down and lazy it's probably indica dominant.