P3D random dot eidetikers

[Martin Simon <msimon@xxxxxxxxxxxxxxxx>]

>There was some controversy as to whether eidetikers (as they are called)

>An experiment was designed where test subjects were shown two sections
>of a 10,000 dot SIRDS image (each eye separately, separated by 24 hours). 
>One of the test subjects was able to "project" the images together and
>bring up the 3-D image (a floating square above the surface), whereas it
>had not been seen with the individual image(s).  
>I was also surprised because I didn't think that SIRDS were really well 
>known before the mid 80's.

Experiments like this are briefly described in Bela Julesz's 1971 book,
"The Foundations of Cyclopean Perception" (along with hundreds of examples
of random dot stereograms).  This is something I would have to see to believe.
I would love the opportunity to test someone who has these powers.  I have
heard reports that there have been a few eidetikers studied at UCLA's 
neuropsych center who could do this with stereograms.  It is very remarkable 
and I don't understand how it could work.

>There were additional tests run using color perception via the "Land"
>filter process, and so forth. The article said that tests of young
>children showed many had this capability, but very few adults. It would
>be interesting if the photo-3d population were statistically significantly
>different in this regard...

I have recently been experimenting with "Land pictures", but I haven't quite
got it to work as well as I hoped.  I have not been able to create a convincing
sensation of blue from projections of a red and green (or white) record.  If
anyone knows how to "bring out the blue" I would be interested in hearing from
them.  I shot b+w scala slides of a many colored still-life through red, green,
and no filters.  The idea is to recreate all the color sensations by playing
the slides back through red and green filters.  All the colors come out for me
except for blue.  

Martin Simon   mailto:msimon@xxxxxxxxxxxxxxxx
Martin Simon     
mailto:msimon@xxxxxxxxxxxxxxxx     
http://www.physics.ucla.edu/~msimon


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