On Oct 12, 2011, at 9:44 PM, Craig Weinberg <whatsons...@gmail.com> wrote:

http://serendip.brynmawr.edu/exchange/node/1676

"As stated above, blindsight is seen clinically as a contrast between
a lack of declarative knowledge about a stimulus and a high rate of
correct answers to questions about the stimulus (1). People suffering
from blindsight claim to see nothing, and are therefore unable to
reach spontaneously for stimuli, cannot decide whether or not stimuli
are present, and do not know what objects look like. In this sense,
they are blind. However, they are able to give correct answers when
asked to decide between given alternatives (1). Studies done with
subjects that exhibit blindsight have shown that they are able to
guess reliably only about certain features of stimuli having to do
with motion, location and direction of stimuli. They are also able to
discriminate simple forms, and can shape their hands in a way
appropriate to grasping the object when asked to try. Some may show
color discrimination as well (2). Subjects also show visual
capacities, including reflexes (e.g. the pupil reacts to changes in
light), implicit reactions and voluntary responses (3). "

Sounds like absent qualia to me.

"people suffering from blindsight claim to see nothing"

So Stathis, Jason, Bruno... how do you know that your computer brain
doesn't have blindsight if it's eyes seem to work? Is it lying when it
says it can't see, or is it seeing without being able to look at what
it is seeing?


It seems blindsight is the result of some modules receiving visual information but not all the modules which would normally receive it.

In any event, one with blind sight is not functionally equivalent to a normally sighted person.

If a robot does things that only something that can see can do, then there must be something within it that sees.

That some person maintains they cannot see is not proof that nothing in their head is seeing. Consider split brain patients, when you hold a conversation with a split brain patient, which hemisphere are you talking to? What might the other hemisphere be aware of that the other is not?

Jason

Craig

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