On 05 Mar 2013, at 19:39, Craig Weinberg wrote:
On Tuesday, March 5, 2013 12:45:11 PM UTC-5, Bruno Marchal wrote:
On 05 Mar 2013, at 08:43, Jesse Mazer wrote:
On Mon, Mar 4, 2013 at 11:27 PM, Pierz <[email protected]> wrote:
Really Craig? It invalidates mechanistic assumptions about eyes?
I'm sure the researchers would be astonished at such a wild
conclusion. All the research shows is brain plasticity in
interpreting signals from unusual neural pathways. How does that
invalidate mechanism?
Yes, I was confused at first by the statement in the first
paragraph that the eyes "can confer vision without a direct neural
connection to the brain" (maybe Craig was confused by this too?),
but it seems that by "direct neural connection" they just mean an
optic nerve wired directly to the brain, bypassing the spinal cord
like the optic nerve normally does, since later in the article they
do mention the eyes were connected (indirectly) to the brain via
the spinal cord: "No one would have guessed that eyes on the flank
of a tadpole could see, especially when wired only to the spinal
cord and not the brain."
Even that would not be conceptually astonishing. My computer is not
wired to anything, and I can still send you a mail. It would have
meant only that optic cells have some wifi systems. Cute, without
doubt, but still not a threat for computationalism. Improbable also,
but who knows.
Bruno
If they were wireless from the start though, why use an optic nerve?
OK. That's show only that biological evolution did not invest in radio
waves. Why? Interesting question. Probably not enough profitable
locally, contrary to direct exchange of biochemical material.
Bruno
Craig
Jesse
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