Re: Effects of Eye Position on Stereo Perception

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 3:16 AM -0700 4/18/97, P3D Peter Homer wrote:
>This topic would seem to be relevent to this group when it concerns stereo
>perception. The eyes converge on objects they are viewing and it was quite
>a logical early view that this convergence gave information on depth by a
>kind of triangulation. But I had a photocopy from a book on psychology that
>stated that that theory and experimentatation showed that convergence of
>the eyes played little or no part in depth perception .

It's very weak, yes.  The effect on size perception is more noticeable (at
large vergence angles, i.e. as though you were looking at something near,
things tend to look smaller), which is interesting given that you'd
logically expect the two effects to be linked & similar.  There was a
discussion about this a few months ago, try searching the archives under
"vergence micropsia".

-Jim C.

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Jim Crowell
Division of Biology
216-76
Caltech
Pasadena, CA
(818) 395-8337
jim@xxxxxxxxxxxxxxx



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