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Re: resolution of retina

  • From: T3D john bercovitz <bercov@xxxxxxxxxxx>
  • Subject: Re: resolution of retina
  • Date: Tue, 2 Sep 1997 08:19:58 -0700
Peter Abrahams writes:

> Horizontal or vertical lines are seen equally well, but lines at 
> 60 or 120 degrees to horizontal are about one third as visible.

You might add that this is learned.  An experimenter who had his
lab near our offices down at the UCB campus 20 years ago did
experiments on cats.  He raised some cats in a horiz/vert line
deprived environment and some in a horiz/vert line enhanced
environment.  When the cats matured, the deprived cats could not
see horizontal and vertical lines at all well.  Humans raised
in an horiz/vert line deprived (natural) environment supposedly
also exhibit this lack.  Sorry I don't know any sources for these
things.

John B


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