Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!sun!imagen!atari!portal!cup.portal.com!jxh
From: jxh@cup.portal.com (Jim - Hickstein)
Newsgroups: comp.graphics
Subject: Re: 3-D perceptual abilities
Message-ID: <15290@cup.portal.com>
Date: 3 Mar 89 01:36:02 GMT
References: <2492@masada.cs.swarthmore.edu> <289@val.UUCP>
Organization: The Portal System (TM)
Lines: 15

...yes, but all this about stippling patterns and chain-link fences is
not at all what I meant when I started this.  Those are merely illusions
arising out of the inherent limitations of accomodation as a stereo cue.

I'm talking about the loss of *perception*, not just a single cue or the
failure of a single cue to give correct results.  Of all the talk about
patterned surfaces, I've only seen one response (I think) that indicates
the experience I'm talking about.  In this mode, I really couldn't say
whether I could touch that wall over there or not until I put my arm out
and it works (or doesn't).  This is the same FOR THE MOON (world knowledge
notwithstanding).  All cues are ignored, except at the very highest
levels of cognition (no, I probably can't touch the moon); but this is
a phenomenon (singular) of the visual cortex (um, I think).

Any others?  Really?  -jxh