>There are not, after all, upper and lower hemispheres to the brain!
>The left-right reversal actually involves fibers decussating from the
>left side of the brain to the right side of the body. There is nothing
>so clearcut for "upside down".
Well... there is... humans are bipedal... if we're not sitting, or
sleeping, we are pretty-much always holding our bodies in one special
orientation with respect to "gravity", etc... our legs just don't
have ranges of motion that are analogous to the ranges of motion of
our arms... the inverted visual system is mapped exactly to the inverted
somatosensory & motor maps in the cortex with respect to this one
stereotypical body orientation... ken collins
