Re: Ferwerda's book

[P3D Gabriel Jacob <jacob@xxxxxxxxxxxxxx>]

>There's useful information on the distribution of interpupillary distance,
>but I don't agree that stereoscopes for kids are unimportant. The text notes
>that "stereopsis and spatial observation are not yet completely developed
>in those younger than 10", but I don't believe that they have *no*
>utility to that age group.
>
>John R

Yea there is some aspects I don't agree with also, but other an excellent
book, as you mention.

The "stereopsis and spatial observation" might not be "completely" developed
but they (under 10) nevertheless can see true 3D.
My seven year old gasps at the 3D images in a 3Discover and sees the same
3D with Pulfrich segments. Of course the enthusiasm for Pulfrich is not
the same as in the 3Discover. Another perfect example where children can
see stereo is in random dot stereograms. Alot of kids can see these; younger
than 7 years of age. And there is no doubt, they see them because they
can describe the hidden image. So yes, I agree with your statement that it
can be utilized by that age group pretty easily.

I wonder if those comments were made from experimental testing or was just
current thinking because at the time other factors such as intelligence in
infants was thought to be limited.

Gabriel


------------------------------