Re Upside down view

[P3D Peter Homer <P.J.Homer@xxxxxxxxxxxxxxxxx>]

This is geting off topic but I have managed to locate some references to
upside down viewing using lenses and mirrors. Human sense and perception
1964 by G.M.Wyburn , R.W.Pickford and R.J. Hirst refers to a person by the
name of Stratton who used inverting Lenses and an Erisman and Ivo Kohler
who used a flat mirror above the eyes with the direct vision blocked off.
After a month of use the subject could make correct adaptive movements
although the objects still seemed inverted later still they did not appear
to be be inverted . Vision and movement was not so well adapted as normal
though and Pranko(if I read my scribbled notes right) gives an example of a
subjest stood on the parapet of a high building looking at other buildings
. Which looked normal to them untill asked if they looked the right way up
when they reakised they were not.
 Ivo Kohlers subjects could eventualy ride bicycles through busy streets ,
when the glasses were removed the subjects were confused at first and saw
objects upside down but recovered in a few days and did not take longer to
adjust than when the glasses were put on as I had originaly thought. The
earliest reference for this sort of work seems to be someone called
Helmholtz 1867 and some of the later ones were still in the last century
such as Stratton in tge 1890,s . According to the above book Shicaka (If I
read my notes right again) more recently showed no statistical difference
in size shape brightness between inverted and normal. I have also found
another book which gives more references and dates.            P.J.Homer



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