I think I read this in the 1980s or possibly 1990s (pre-1995): a short novel (SF, but not rigorous "hard" SF, if I recall correctly), and I know this wasn't the main thing, but it's what sticks with me:
The characters had a Memory Creature of some sort (I want to say "memory potto" like hippopotamus, but that would be silly as hippos are huge, and I think these were shoulder-mounted?)
I think they were to offload part of the human brain's "processing" so they could do other types of thinking, then use the Memory Thing to flesh out details? Like having a rough idea, then checking Wikipedia to confirm dates and details.
Using it was as casual as we'd now say that we copied a file onto the work shared drive (but I think these were solo, not collaborative creatures). I don't recall if using the memory thing removed the details from the original mind, or if it meant that like the current "Google Effect," people don't need to try to remember things, since they can always look them up.
(Alas, trying to DuckDuckGo this only finds things about "potatoes")