23 August 2016

The Atlantic: Best Friends Build Shared Memory Networks

In science, this is known as a transactive memory system. Transactive memory systems (TMS) are repositories of knowledge that are shared between two or more people. A shared memory of events, like with me and my friends, above, can be part of it, but it’s also a way of calling up facts that other people know. If you say “Oh, what’s the movie that starts with that whistling cartoon rooster?” and I say “Robin Hood,” that’s transactive memory. You have access to my knowledge, and vice versa. But, it only works if we trust each other that we both know what we’re talking about, and that we know we can call on each other for the knowledge if we need it.

These systems have so far been studied in romantic relationships and work groups (coworkers, classmates, groups slapped together in the lab). A new paper published in the Journal of Social and Personal Relationships looks at transactive memory in the context of best friendships. The researchers asked people to answer questions about their relationship with their best friend—how satisfied and committed they were to the friendship, how long they’d been friends, things like that, as well as questions designed to measure the strength of their TMS, like “I trust that my best friend has credible knowledge.” [...]

There are two different structures of a TMS—differentiated and integrated. In an integrated TMS, friends share similar knowledge and are able to reinforce or remind each other of what they know. In a differentiated TMS, they have knowledge of different things, and can consult each other like encyclopedias. The researchers found that in mixed-gender best friendships, TMSs were more likely to be differentiated, while in same-gender best friendships, they were more likely to be integrated. But regardless of the gender makeup, the systems were equally strong.

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