Re: weighting depth cues - monocular blur

[T3D Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 6:06 AM -0700 7/31/97, T3D Richard Young wrote:
>
>Gerald Westheimer's reply to Jim:
>"Westheimer G, McKee SP  (1980) Stereoscopic acuity with defocused and
>spatially filtered retinal images.  Journal of the Optical Society of
>America 70:772-778. Fig. 2 shows impairment of stereoacuity with spectacle
>blur, Table 1 compares uniocular and binocular blurs.  A 2.5 diopter
>monocular blur gives about twice the stereoacuity deficit of an equivalent
>binocular blur."

Sorry, I guess I wasn't very clear.  I wasn't questioning whether a
difference in acuity between the two eyes would hurt stereoacuity, but the
importance of good stereoacuity for flying...part of the problem being that
rapid fluctuations in the local luminance pattern (e.g. rapid motion across
the retina, such as you'd get when flying near the ground) also degrade
stereoacuity.  Clif Schor did the study, I don't have a reference for it.

>
>My guess: pilots under good flying conditions can fly ok with no
>stereopsis, but in stressed conditions in which correct spatial perception
>is critical (crash landing, landing under poor visibility, another plane in
>the flight path) the extra cues provided by stereopsis would provide a
>quicker reaction time and a better decision about flight path. Does anyone
>on this list have a contact at the Wright-Patterson airbase psychology
>research labs? I am sure this question must have been investigated
>thoroughly...
>

I agree, they'd probably know the answer if anyone would.

-Jim C.

----------------------
Jim Crowell
Caltech Division of Biology
216-76
Pasadena, CA
Tel: (818) 395-8337
Fax: (818) 795-2397
jim@xxxxxxxxxxxxxxx



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