Human memory is a lot like a library filled with thousands of books. Each book is sealed in an anonymous dust jacket and labeled with some numerical identifier and shelved according to some wacky algorithm. Within each book is a description of some discrete concept and a pages of tags and references pointing to other books. At the front desk in this library is a card catalog containing a mapping of symbol names to book identifiers. The references in the backs of those books are symbol names which is important to recognize. For completeness, I should also point out that there is a small shelf near the front door housing a few uncatalogued books and a short list of their respective symbol names.
In my little analogy, the shelves and shelves of books are long-term memory, the small shelf by the front door is short-term memory, and the card catalog represents “knowing” something. I’ll explain this last bit using the model that I’ve just described:
When we are first introduced to some new topic we bring that topic into our “new releases” section at the front of the library and write it down on a list; this is so we can quickly look up this information without having to dig around in the card catalogs and wheeling around those funny looking library-ladders you see so often in movies set in fancy colleges and British schools. Very often we will be introduced to something that just isn’t worth putting into the library forever, so we just discard the book from the short-term shelf and never bother putting it into the card catalog. Less often we will want to remember something because it is useful to do so, and we will go through the motions of:
- putting on a nice dust jacket
- filling out a symbol-to-identifier lookup card
- figuring out what other books it seems to reference in our library, and scratching those down in the very back of the book as notes to ourselves
- finding a place for it in the stacks
Now say that while you were busy stuffing new cards into your exquisite card catalog that some of the symbol-name cards began to stick to other cards, the writing on older cards faded, and some cards fell out of place and out of the little drawers holding the cards. Just because you can’t find the card doesn’t mean the book isn’t out there, playing hide-and-seek in the stacks. The knowledge about that topic is still in your brain but you just can’t figure out how to get at it. The system that I’ve outlined above seems to be rather error-prone, so I shall now extend it to offer some redundancy and backup.
Over time, you’ll find yourself looking up certain books in series. For example say you wanted to look up the book on dogs. You’d swing by the card catalog and take out the card for dogs, examine the identification number and weave your way through the stacks to find the dog-book. After refreshing yourself on dogs you turn to the back of the dog-book and peruse the list of references. Due to the frequent mention of ‘cats’ in the dog-book, you decide to look up the reference for ‘cats’. You put the dog-book back and have to go all the way back to the catalog, replace the dog-card, find the cat-card, and navigate to the cat-book. If I were doing this every day, I’d get really annoyed and probably whip out a pen and start copying down the list of dog-references and their identification numbers onto the dog-card. Then the mapping of symbols-names to book-identifiers would be somewhat redundantly preserved with associated books. In my analogy I could go straight from the dog-book to the cat-book without hopping back to the catalog since I’m still carrying around the dog-card with all of that additional metadata on it.
Now that I’ve extended my analogy, I can explain what happens when we forget. Say that I was reading a new book about blindness and it mentions ‘seeing eye dogs’. I want to look up information about dogs, so I go on over to the catalog and lookup the symbol ‘dog’. Unfortunately the dog-card has gone missing, so I am left with this weird feeling of knowing that I know something, but can’t get at it. I think we’ve all experienced this when watching quiz-shows on TV or taking a cumulative final exam. It’s a frustrating feeling, but the very way that memory works we can usually find circuitous routes back to the requested information. In my analogy we could randomly start going through the catalog looking for really general symbols (like ‘object’, ‘person’, ‘life’, etc.) looking for something that references ‘dog’. If we dig around long enough we’ll stumble across the pet-card or even the cat-card, each of which contains some sort of copied identifier information from the dog-card if the association between pet/dog (or cat/dog) was strong enough to warrant the copy. By following loose-links we can recover the information that we temporarily lost access to, and potentially even recreate the missing dog-card from the related cards.
The Point
Now that we live in the era of online search engines being quite useful, how many times per day do you find yourself querying the Internet for something that you have temporarily forgotten? The most useful search queries I perform are of the type “I know what I’m looking for because I know that I used to know it.” The task then becomes to quickly scan over the information on the result pages and the temporary forgetfulness is averted. It’s a similar effect to surrounding yourself with lots of thick reference manuals: you are outsourcing your memories by filling your brain with more information and letting some external source provide you with hooks into that memory, rather than digging through your own internal card-catalog hoping to find some references for the forgotten-item.
With the unification and normalization of a hefty chunk of human knowledge, we’ve built a Global Memory that anyone on the Earth with access to a computer and Internet connection can use to extend the utility of their own minds. Rather than wait for evolution to get around to extending our brain-size, we’ve hacked around the problem with engineering.
Note that I am calling it a Global Memory, not a Global Consciousness. Something of that nature requires a few more orders of magnitude of hackery to form, and is quite a bit more scary.