do bird visual fields have overlap?

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2 total messages Started by Patrick van der Smagt Tue, 01 Jun 1993 19:33

#4622

Author: Patrick van der Smagt
Date: Tue, 01 Jun 1993 19:33

18 lines
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For my thesis I am developing a system which uses a
monocular visual system mounted to a robot arm.  One
of the methods I use is related to a theory about
how a gannet catches a fish: it uses image flow which
is reconstructable from a sequence of images obtained
with a *single* retina.

Now in order to defend my control system I like to argue,
look, basically animals such as most birds, and horses,
have hardly *any* overlap in their two visual fields,
and therefore cannot be truely argued to have stereo vision.
Rather, they have mono vision twice, since their eyes are
mounted on the side of their heads.

But it this true?  How much overlap do their visual fields,
indeed, have?  Do birds see stereo?

						Patrick

Re: do bird visual fields have overlap?

#4623

Author: Andrew Taylor
Date: Wed, 02 Jun 1993 00:39

13 lines
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In article <1ugav7$ipa@mail.fwi.uva.nl> smagt@fwi.uva.nl (Patrick van der Smagt) writes:
>But it this true?  How much overlap do their visual fields,
>indeed, have?  Do birds see stereo?

There is great variation, some birds such as Hornbills have no overlap
others such as Owls have a large overlap similar to ours. Most would have
some overlap, some have overlap both to the front and to the rear.
The Woodcock has more overlap to the rear than the front!

Stereoscopic depth perception has been demonstrated in some birds.
Welty's Life of Birds is good starting point for questions abour birds.

Andrew Taylor

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