Turns out pregnancy brain might be just a myth: this Australian study found that being pregnant had no impact on cognitive ability. The researchers suggest that normal mental hiccups get blamed on pregnancy simply because their gravid state is very much on pregnant women's minds: "It makes it very easy to attribute what might be just normal lapses in memory to pregnancy," said one of the researchers.
Hmmmm. Next thing you know, they'll be debunking mommy brain! (Actually, on my reading stack at the moment is The Mommy Brain: How Motherhood Makes Us Smarter by Katherine Ellison. Haven't started it yet, but I'll report back when I have.)
Personally, I think whatever pregnancy brain or mommy brain effects might exist have a lot more to do with how being pregnant or being a mommy means months (years!) of deprived sleep. Because, honestly, doesn't it affect Dads too? Sure does in my household!
Perhaps we should just start calling it Too Damn Tired To Think Brain. (And while I am certainly suffering from a bit of TDTTTB today -- case in point being the fact that I can't come up with a better acronym than that! -- I'm happy to report that I can NOT blame it on pregnancy brain. Just in case you were wondering.)