Transactive memory with a machine

Thirty years ago Daniel Wegner proposed the concept of transactive memory which Wikipedia defines as:

a mechanism through which groups collectively encode, store, and retrieve knowledge
Although that same Wikipedia entry notes that this is different from distributed cognition because as opposed to distributed cognition where a "complete" understanding of a certain body of knowledge is spread out between various members of a group, transactive memory:
describes a situation where individuals hold different knowledge compared to shared information, and members of the group engage in transactions to assist in recall of the stored information
In other words, if I correctly understand the distinction, with transactive memory different members of the group are capable of helping others retrieve what they may be looking for.

Frankly, I'm not sure there's that great a difference, particularly since distributed cognition isn't very workable without a means of retrieval. Back in 1998, in what at one point I thought might become a central focus of my studies, I proposed examining forums as repositories of distributed cognition, but all that remains of that (online) is an attached but separate section of the Boidem.

Clive Thomspon, in a 2013 article in Slate (an excerpt from his book Smarter Than You Think: How Technology is Changing Our Minds for the Better) brings an example of a long-married couple helping each other remember certain details (from a 2009 study on transactive memory) and remarks:
They were, in a sense, Googling each other.
A bit later he explains:
And as it turns out, this is what we’re doing with Google and Evernote and our other digital tools. We’re treating them like crazily memorious friends who are usually ready at hand. Our “intimate dyad” now includes a silicon brain.
In my mail I'll sometimes find something via a label I've created, and sometimes I'll run a search for a particular word or term that I expect shows up in what I'm looking for. Friends also function as labels. I can usually find a particular item I'm looking for by determining with whom I might have shared, or discussed, it.

Because my interaction with my mail is a transactive memory system, vague is often sufficient.

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