Re: [agi] Brain memory Map Article -

[Matt Mahoney]

Prior to reading this article it was my belief that the purpose of dreaming 
(REM sleep) was to copy medium term (daily) memories from the hippocampus to 
long term memory in the cerebral cortex.  REM sleep occurs in only 2 of the 3 
orders of mammals: placentals (which include humans and rodents) and 
marsupials.  Egg laying mammals such as the spiny anteater do not dream and 
have a much different brain structure.

I find it a mystery why memories are played back at high speed in reverse 
order, with excitations in the cortex preceding those in the hippocampus, and 
that this occurs during non REM sleep.  Perhaps this is part of a feedback loop 
to erase memories from the hippocampus after they have been copied.
 
-- Matt Mahoney, [EMAIL PROTECTED]

- Original Message 
From: Bob Mottram [EMAIL PROTECTED]
To: agi@v2.listbox.com
Sent: Tuesday, December 19, 2006 8:45:34 AM
Subject: Re: [agi] Brain memory Map Article -


I was also reading that article.  The place cell phenomena has been known for 
many years.  For a long time I've thought that sleep might be used for 
something other than just down time and cellular repair, and this research does 
seem to confirm that sleep has some functional role.  It's interesting that 
memories are played back in reverse, which might suggest some form of 
back-propogation in which the brain is searching for the most likely causes of 
interesting events.







On 18/12/06, James Ratcliff [EMAIL PROTECTED] wrote:
Interesting article on how they really exhaustively mapped a rats brain...

The researchers could interpret the memories through electrodes inserted into 
the rats' brains, including into special neurons in the hippocampus. These 
neurons are known as place cells because each is activated when the rat 
passes a specific location, as if they were part of a map in the brain. The 
activation is so reliable that one can tell where a rat is in its cage by 
seeing which of its place cells is firing.


http://www.nytimes.com/2006/12/18/science/18memory.html?ref=us


James Ratcliff


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Re: Motivational Systems of an AI [WAS Re: [agi] RSI - What is it and how fast?]

[Joel Pitt]

On 12/21/06, Philip Goetz [EMAIL PROTECTED] wrote:

That in itself is quite bad.  But what proves to me that Gould had no
interest in the scientific merits of the book is that, if he had, he
could at any time during those months have walked down one flight of
stairs and down a hall to E. O. Wilson's office, and asked him about
it.  He never did.  He never even told him they were meeting each week
to condemn it.

This one act, in my mind, is quite damning to Gould.


Definitely. I strongly dislike academics that behave like that.

Have open communication between individuals and groups instead of
running around stabbing each other's theories in the back. It just
common courtesy. Unless of course they slept with your wife or
something, in which case such behaviour could possibly be excused
(even if it is scientifically/rationally the wrong way to go, we're
still slave to our emotions).

--
-Joel

Unless you try to do something beyond what you have mastered, you
will never grow. -C.R. Lawton

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