Dennis Gorelik wrote:
Richard,
Did you know, for example, that certain kinds of brain damage can leave
a person with the ability to name a visually presented object, but then
be unable to pick the object up and move it through space in a way that
is consistent with the object's normal use ..... and that another type
of brain damage can result in a person have exactly the opposite
problem: they can look at an object and say "I have no idea what that
is", and yet when you ask them to pick the thing up and do what they
would typically do with the object, they pick it up and show every sign
that they know exactly what it is for (e.g. object is a key: they say
they don't know what it is, but then they pick it up and put it straight
into a nearby lock).
Now, interpreting that result is not easy, but it does seem to tell us
that there are two almost independent systems in the brain that handle
vision-for-identification and vision-for-action.
That's not exact explanation.
In both cases vision module works good.
Vision-to-identification works fine in both cases.
In this case identified object cannot produce proper actions, because
connection with action module was damaged.
In another case identified object cannot be resolved into language
concept, because connection with language module was damaged.
Agree?
I don't think this works, unfortunately, because that was the first
simple explanation that people came up with, and it did not match up
with the data at all. I confess I do not have time to look this up
right now. You wouldn't be able to read one of the latest cognitive
neuropsychology books (not cognitive neuroscience, note) and let me know
would you? ;-)
Richard Loosemore
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