Re: CHAT: Ultraviolet (was: Orange)

>From: Christophe Grandsire <christophe.grandsire@...>
>
>En réponse à Andy Canivet <cathode_ray00@...>:
>
> >
> > However - the stereoscopic cells in the visual cortex are dependent on
> > eye
> > development - we detect distance / perspective using several visual
> > clues,
> > as well as special cells specifically adapted for the task.  People
> > with
> > congenital myopia, astigmatism, etc., or whose eyes develop a little
> > more
> > slowly than normal, will have undeveloped stereoscopic cells.  It isn't
> > much
> > of an impairment, except that without stereoscopic cells a person
> > probably
> > wouldn't be a very good fighter pilot or baseball player - and among
> > other
> > things, will never be able to see the secret picture in one of those
> > "Magic
> > Eye" illustrations, no matter how hard they try.
> >
>
>Well, I do have a sight good enough to become a fighter pilot (though I
>abandoned that path after 1 week in military school), but I do have
>difficulties seeing those "secret pictures". In fact, when I see them, they
>appear inversed to me (what should be in front appears back, and
>vice-versa). I
>don't know where it comes from...
>
I think those things are pretty tricky to see even if you have your
stereoscopic cells - and you would have to have them if you see anything
other than a flat page.  The reversal could be a perceptual disembedding
thing - kind of like the "Necker cube" illusion (the transparent cube that
looks popped in or popped out) or the Vase-face  illusion (a vase, or two
faces looking at each other)... at first you see one picture, then you
notice the details of another picture and see it instead, but never both at
the same time.  The picture you see first is just a matter of luck I think.

I suspect if you looked at a magic eye long enough, you'd see the other
side.  Next time you see one, try to focus your attention on the negative
space instead of the image, and don't to keep yourself from trying to
evaluate what the picture actually is, and it may help to shift your
perception.

Andy




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