[photo-3d] seeing 3-D: innate

["Robert A. Schreiber" <bschreib@xxxxxxxx>]

    Actually, one of the most famous studies in experimental psychology
was designed to answer just this question.  Imagine a cube 3' x 3', with
a checkerboard design on it..Then put a 3' x 6' piece of glass over it,
so that the first 3x3 is on top of the cube.  The floor is then painted
with the same checkerboard design...(I'm leaving out all the parts of
the design to ensure safety)...And various animals, including crawling
babies,  were put on the 3x3 cube.  If there were no 3-D, then you would
expect equal time on both sides of the 3x6.  In fact, everything tested
all have 3-D, and were scared to venture over the edge.
    I remember this from undergraduate school, over 30 years ago, so
most of the details are gone, but it's in almost every introductory
psych book.
    Our optic nerve has an optic chiasm at the base of the brain - half
the information from each eye goes to the left hemisphere, and half to
the right.
Bob Schreiber