Well, LTP is definitely real ... and I'm quite sure the scheme you describe is *not* how learning works in the brain ;-) ,,, but I'm equally sure that the full story has not yet been uncovered...
ben On Wed, Dec 3, 2008 at 5:25 PM, Matt Mahoney <[EMAIL PROTECTED]> wrote: >> http://www.newscientist.com/article/mg20026845.000-memories-may-be-stored-on-your-dna.html > > Actually, this makes sense. It explains most of the discrepancy between the > 10^9 bits of human long term memory estimated by Landauer and the 10^15 > synapses in the human brain. If memory is stored in neurons (by gene > regulation to control activation threshold), then you have only 10^11 bits of > storage, or 1 bit per neuron. > > Here is how it could work. Imagine a neural network with fixed, randomly > weighted synapses. Then insert a neuron at each synapse with one input and > one output. Then you could apply Hebbian learning by modifying the > conductivity of the middle neuron. If the input and output neurons fire at > the same time, then the middle neuron would lower its threshold if both > weights are the same, or raise it if the weights have opposite sign. In other > words, instead of > > A -> B > > with a variable weight, you have > > A -> M -> B > > with a middle neuron M of variable conductivity and two fixed weights. > > Of course real neurons have thousands of inputs and outputs. This means that > there are thousands of neurons between A and B, and these middle neurons > connect to thousands of others. If these connections are random, then Hebbian > learning applied to these thousands of middle neurons would correlate only > with AB and create minor noise for other neurons. > > -- Matt Mahoney, [EMAIL PROTECTED] > > > > ------------------------------------------- > agi > Archives: https://www.listbox.com/member/archive/303/=now > RSS Feed: https://www.listbox.com/member/archive/rss/303/ > Modify Your Subscription: https://www.listbox.com/member/?&; > Powered by Listbox: http://www.listbox.com > -- Ben Goertzel, PhD CEO, Novamente LLC and Biomind LLC Director of Research, SIAI [EMAIL PROTECTED] "I intend to live forever, or die trying." -- Groucho Marx ------------------------------------------- agi Archives: https://www.listbox.com/member/archive/303/=now RSS Feed: https://www.listbox.com/member/archive/rss/303/ Modify Your Subscription: https://www.listbox.com/member/?member_id=8660244&id_secret=120640061-aded06 Powered by Listbox: http://www.listbox.com
