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?
I do not know of any *normal* creature of this sort. However, there
is a very famous clinical case, the so-called "motion blind patient".
This woman has suffered damage to visual system MT from a stroke.
Her ability to see static objects is unaffected, as measured by a
large number of standard psychophysical techniques. However, her
ability to see movement has almost been totally erased. For details,
Zihl, J., von Cramon, D., & Mai, N. (1983). Selective disturbance
of movement vision after bilateral brain damage. Brain, 106,
Hess, R.H., Baker, C.L., & Zihl, J. (1989). The "motion-blind" patient:
Low-level spatial and temporal filters. Journal of neuroscience, 9,
Michael R.W. Dawson email: mike at psych.ualberta.ca
Biological Computation Project, Department of Psychology
University of Alberta, Edmonton, AB CANADA T6G 2E9
Tel: +1 403 492 5175 Fax: +1 403 492 1768