[Q] Visual detection of moving vs. stationary stimuli

[John Anderson in Anderson Lab]

mike at psych.ualberta.ca (Mike Dawson) writes:

>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.  

This has always struck me as very weird.  What does she see instead of
motion?  Nothing?  Or a series of "still images"?  (But wouldn't this
"look" like motion?)  Or what?

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