T3D Re: Pulfrich Effect Timing Measurement

[Gregg Podnar <Gregg_Podnar@xxxxxxxxxxxxxxxxx>]

Dave,
       What you should expect to see is a spinning disk which is not
       parallel to the screen, in other words tilted forward or back,
       and intersecting the plane of the screen along the horizontal
       diameter.
       
       A stimulus such as you describe would be very difficult not to
       fuse.  Is it possible that you missed the depth because you
       were not looking for it?
       
       I have presented stereoscopic motion pictures on the computer
       screen which were out of sync by 0, 1 or 2 frames (they were
       being updated sporatically).  This was obvious when no viewing
       system was being used, but when one image was presented to
       only one eye, and the other to the other, they appeared smooth.
       
       Try the experiment again with say, a read dot and a blue dot
       on your disk laying side by side along a line drawn from the 
       center to the edge.  (Maybe put another pair 180 degrees around
       with the other color near the edge.)  Maybe try black, white and 
       grey disks.
       
       Wear a ND filter over one eye and add a traditional pair of
       anaglyph glasses.  Each eye sould see only one dot, and you
       should be able to detect their vernier misalignment.  By
       estimating it for one pair, and the other, you should have
       a fair number.
       
       Remember, the blue will appear further away and the red closer
       due to chromatic aberation.  There may also be some perceptable 
       delay of the visual system processing time for one color over the other.
       
       Gregg
       


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