Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ucsd!nprdc!malloy
From: malloy@nprdc.arpa (Sean Malloy)
Newsgroups: comp.graphics
Subject: Re: 3-D perceptual abilities
Message-ID: <1508@skinner.nprdc.arpa>
Date: 22 Feb 89 16:31:13 GMT
References: <6382@thorin.cs.unc.edu> <6511@cadnetix.COM> <14496@cup.portal.com> <14825@cup.portal.com> <1232@ssc-bee.ssc-vax.UUCP>
Reply-To: malloy@nprdc.arpa (Sean Malloy)
Organization: Navy Personnel R&D Center, San Diego
Lines: 24

In article <1232@ssc-bee.ssc-vax.UUCP> chas@ssc-vax.UUCP (Chas Boyd) writes:
|In article <14825@cup.portal.com>, jxh@cup.portal.com (Jim - Hickstein) writes:
|> While we're on the subject of human visual perception, specifically
|> stereopsis, has anyone else noticed that their *perception* of 3-d,
|> not just stereopsis, occasionally "goes flat" under
|> stress of, say, sleep deprivation? ...

|Rather, I tend to have the opposite problem, I combine flat surfaces to form
|three-dimensional patterns: repeating patterns on a carpet seem to shift by
|one or two "periods" and lift up vertically, as though a foot or two of water
|was in the room. 

I have had effects like this when laying on my back looking up at an
acoustic-spray ceilings. The points in the ceiling coating 'drop off'
and form a layer of blobs drifting relative to the ceiling. Under some
conditions, I can get multiple layers, drifting in different
directions. It can be quite entertaining to watch, particularly when
listening to music.


	Sean Malloy
	Navy Personnel Research & Development Center
	San Diego, CA 92152-6800
	malloy@nprdc.navy.mil