On Mon, Aug 29, 2011 at 10:09 AM, Craig Weinberg <whatsons...@gmail.com> wrote:

> PS - Someone mentioned "The Man Who Mistook His Wife for a Hat" to me
> today. Are you familiar with agnosia? Is that evidence that partial
> zombies conditions with absent actually exist? If not, why not?

There are conditions called anosognosias: where the patient has a
sensory or cognitive deficit but does not recognise it. A good example
is Anton's Syndrome, where a patient with a lesion in his occipital
cortex is blind but claims to have normal vision, and confabulates to
explain why he keeps walking into things. However, this differs from a
visual partial zombie, which is defined as both behaving as if he has
normal vision and believing that he has normal vision while in fact
lacking visual qualia. The patient with Anton's Syndrome lacks visual
qualia, mistakenly believes that he has normal vision, but does not
*behave* as if he has normal vision since he keeps walking into
things. If both the belief and behaviour are intact while the qualia
are missing that puts us in a difficult position, since it is possible
that we all lack visual qualia on Tuesdays but never realise it.

Stathis Papaioannou

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