hucka at engin.umich.edu (Michael Hucka) writes:
>2) Does anyone know of any creature that has some sort of vision system but
>cannot sense visual motion?
Just a comment -- I must presume from the answers to this question that have
been posted so far that <<neuroscience>> netters have a particular and fairly
complex implicit definition of "visual system" that generally includes all the
apparatus necessary to detect visual motion and thus a restricted definition
I am familiar with a wide range of invertebrates that have fairly rudimentary
"vision systems" -- light sensing organs, etc. in planktonic larvae of sessile
organisms such as bryozoans for instance (and then there are the blue-eyed
scallops 8-) )
I think an interesting side question might be "under what environmental/
evolutionary conditions would detection of visual motion not be necessary or
likely to be selected for.
Kate McCain "die Gedankenexperimente sind frei!!"
College of Information Studies
mccainkw at duvm.ocs.drexel.edu