re: stereovision question

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxxxx>]

At 11:59 PM 4/7/96, P3D Michael Kaplan wrote:
>
>I don't believe stereo perception requires two eyes. All it requires is
>one eye receiving disparate images. As I mentioned a year or so ago, I
>trained myself to view lenticular images *stereoscopically* by rotating
>the lenticular print in front of a single eye. Anyone can perform this
>experiment. I used an Imagetech demo print that had an unusual amount of
>depth, including a bubble extending past the "window."
>

That is depth perception, but it ain't stereo (which does by
definition require two eyes).  The depth cue you're referring to
is called motion parallax.  At an abstract, mathematical level
it is identical to stereo (you can describe motion parallax as
stereo with two eyes displaced in time as well as space, or
stereo as one eye moving back & forth at infinite speed), but in
the brain they're supported by rather different mechanisms.  Up
to a point, anyway; there's probably some level at which the two
converge.

-Jim C.


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Jim Crowell
School of Optometry
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