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I have a question

Michael Olea oleaj at sbcglobal.net
Wed Dec 29 22:36:34 EST 2004


in article 41d36b5a at dnews.tpgi.com.au, John Hasenkam at johnh at faraway. wrote
on 12/29/04 5:59 PM:

> There is a very rare condition when a person can no longer perceive
> movement, only see a series of still shots. Don't know the name of the
> condition, probably related to damage to the visual - parietal areas
> (ventral stream?).

Ramachandran, in "Phantoms in the Brain" refers to it simply as "motion
blindness". He discusses the case of a Swiss woman who had bilateral damage
to MT.

> 
> 
> <behdadm at gmail.com> wrote in message
> news:1104189924.193906.161060 at z14g2000cwz.googlegroups.com...
>> Hi,
>> 
>> I think you are wrong.
>> 
>> "Handbook of Perception and Human Performance" page 16-8:
>> 
>> "It is sometimes mistakenly claimed that the peripheral retina is more
>> sensitive to motion than the fovea. In fact the threshold of motion
>> increases steadily with eccentricity"
>> 
>> Although the rods are more sensitive to motion than cones, there are
>> many other factors that can influence the motion sensitivity of fovea
>> and other parts of field of view. For example, each receptor is
>> connected to one ganglion cell in the fovea, but at the periphery 25
>> receptors are connected to 1 ganglion.
>> 
>> What is your reference?
>> Sorry but I didn't understand the meaning of "AoK, Ap6".
>> 
>> Thanks
>> 
> 
> 




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