Depth Perception Analysis Opportunity

Kenneth Collins k.p.collins at
Sat Aug 17 11:45:12 EST 2002


Caveat: I use a magnifying glass to view maps [haven't been able to afford a trip to the Opthamologist to get new glasses :-] This might be a 'confounding' thing because of the possibility of a lens's differential refraction of Visual-spectrum EM having different frequency, which'd constitute a form of presenting artificially-spatially-differentiated images to either eye, which wouldn't be as interesting as what I proposed below, but, surely(?), there's stuff like 3-D TV in-there.

YIKES! I just viewed a JPEG image of Jupitor's 'red-spot', on my CRT, through my magnifying glass, and it's spectacularly-'pseudo-3-D'!

Caveat: There seems to be an 'after-effect' - like viewing the JPEG image through my magnifying glass imposed an artificial 'strain' within my visual apparatus.

So maybe it's a 'dangerous' idea, rather than a useful one. ['pseudo-3-D imposes pseudo-stuff upon the visual 'system'(?) To the degree that it's artificial, it's just no-good.]

Don't 'sprain'-your-brain, for the sake of this stuff.

k. p. collins

Kenneth Collins wrote in message <9ku79.16619$Ep6.1316262 at>...
>While checking a road atlas, today, to see if I could make it to
>another performance of "the voice filled with Genius" [Martina
>McBride - if you get a chance to attend a performance of hers, don't
>miss-out - her performances are spectacularly-good, and you won't be
>sorry for having experienced her] I was reminded of a a
>rather-well-delineated depth-perception phenomenon that happens when
>I look at road maps.
>The red routes appear 'at-depth' with respect to other map features.
>The phenomenon occurs on;y binocularly [close one eye, and it
>I first observed the phenomenon when I was preparing the maps to be
>included with invitations to my Father's 90th Birthday celebration
>~four years ago.
>It's 'curious' because, "of course", the maps are strictly 2-D
>stuff - yet there's this binocular experience of there being 'depth'.
>Since I first experienced it, I've 'wondered' why I've never read
>about this phenomenon.
>'Wonder' if it's a 'quirk' of my nervous system, or if other folks
>can see it, too.
>Anyway, if it's a 'universal' phenomenon, it presents a very-nice
>opportunity to study at least a bit of the neural dynamics that
>underpin binocular depth-perception. [If anyone 'wonders', I stand on
>what's in AoK, Ap6 with respect to monocular depth-perception.]
>Anyway, have subject-volunteers who preceive the reds 'at-depth' go
>in a scanner and alternate between binocular and monocular viewing of
>atlas pages [I have experienced analogous phenomena when viewing
>CRTs, but, with CRTs is's more whimsical [probably because of the way
>the screen is refreshed via progressive scanning, which doesn't allow
>the visual apparatus to 'settle-in' to an overall relatively-TD
>E/I-minimized 'state' [there's another experiment, waiting to be
>done - paper vs. CRT visual TD E/I-minimization - will surely expose
>'the costs' of prolonged CRT-viewing].
>The neural topology will be differentially-activated in the monocular
>and binocular cases, of course, mostly because of the drastic
>alteration of total-input, but that can be
>mathematically-separated-out, leaving a, probably-small, differential
>that corresponds to this viewing-at-depth phenomenon.
>And, because the phenomenon is with respect to red feature, the
>investigation is likely to shed some new light upon color perception,
>If I was in an academic institution that had an appropriate scanner,
>I'd not hesitate to do this analysis, as a
>'spare-'time'-side-project'. It's the sort of thing that tends,
>strongly, to yield new insights in abundance, and, so, it's a
>worthwhile thing to pursue.
>K. P. Collins
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