They did a vocabulary test and played a game. A year later they did another vocabulary test and memory recall challenge. They found that for the kids that remembered the game they played, if they didn't know the word for something at that point, they wouldn't use that word when recalling, even if they had subsequently learned that word in the meantime between tests.
Their conclusion was that memories were closely linked to the vocabulary the kids knew at the time the memory formed.
Been trying to find it again to no avail, sadly.
I think half the memory might be imagined, which is while I was underwater. I remember it being green and seeing fish nearby, which seems a little unlikely to adult me (I would scare the fish away presumably).
The rest of my memory is being rescued. I'm relatively certain it's a real memory, because I can describe to you what it feels like to have your entire body weight pulling against your scalp, as my dad lifted me out by a handful of hair onto the dock.
It was not painful, as you might imagine. It was rather nice.