On Thu, Sep 13, 2012 at 4:52 PM, Craig Weinberg <whatsons...@gmail.com>wrote:
> the human genome is at least 700Mb, but yeah it's not a lot. > Let's see, the human genome is about 3 billion base pairs long, there are 4 bases so each base can represent 2 bits and there are 8 bits per byte. That comes out to 750 meg, so you're right and I was wrong when I said 400 meg. Maybe there wouldn't be much room to put pop songs onto a CD after the human genome was on it after all. > You can look at what this means in at least two ways though: > 1) Simple rules generate enormous complexity in the universe. > or > 2) Rules are just a tiny part of what the universe is about - it's what > executes the rules that matters > Both are true because some of the rules, probably most of them, are rules about what rules to activate and what rules to turn off. > and experiences. > Those are memories, 750 meg will only get you as you were the day you were born. Calculating the memory capacity of the brain is more difficult but we can find a upper limit assuming, as seems very likely, that memory works by Long Term Potentiation (LTP). There are about 10^11 neurons in the brain and each neuron has about 10^4 synapses. I have not seen any evidence that LTP can store more than one bit so that gives us a figure of 10^15 bits or about 10^14 bytes of storage memory capacity for the human brain. A 3*10^12 byte hard drive cost about $150 and you'd need about 33 of them to get up to 10^14 and that would cost you about $5000, but the price is dropping like a rock and next year it will be less than half that. And this figure of 10^14 is almost certainly a considerable overestimate, I don't know the true figure but it must be less than that. In the January 28 1994 issue of Science Dan Madison and Erin Schuman found that LTP spreads out over a large area so you have lots of copies of the same thing. > so I would say that it really is a view which tainted with reductionist > ideology. > Tainted? Without reductionist ideology we still be swinging in the trees and wouldn't even have stone tools. John K Clark -- You received this message because you are subscribed to the Google Groups "Everything List" group. To post to this group, send email to firstname.lastname@example.org. To unsubscribe from this group, send email to everything-list+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/everything-list?hl=en.