>>>>> On 23 Mar 1994, MCCAINKW%DUVM.BITNET at PUCC.PRINCETON.EDU (Kate McCain) said:
MCCAINKW> I am familiar with a wide range of invertebrates that have fairly
MCCAINKW> rudimentary "vision systems" -- light sensing organs, etc. in
MCCAINKW> planktonic larvae of sessile organisms such as bryozoans for
MCCAINKW> instance (and then there are the blue-eyed scallops 8-) )
MCCAINKW> I think an interesting side question might be "under what
MCCAINKW> environmental/ evolutionary conditions would detection of visual
MCCAINKW> motion not be necessary or likely to be selected for.
Yes, I think that's a very good question.
Basically, I expected that virtually all creatures that had vision would be
able to sense motion as well, though I tried to phrase my question in a
Thanks for your reply,
-- Mike Hucka
University of Michigan, Ann Arbor, Mich.