2019-01-01_Discover

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SMART ADDICTS

To igure out if I have indeed been

misremembering, I call up Kelly

Lambert, a neuroscientist at the

University of Richmond who studied

the maternal brain with my college

professor, the late Craig Kinsley. She

assures me that what I remembered

is true: Mama rats, who give birth to

litters of up to 14 pups, have better

memory, not worse. They’re also

better at catching prey and display less

of the rodent-typical anxiety about

wandering into open areas to ind food

— important qualities for moms with

so many mouths to feed.

Lambert brings up the idea that

the difference between rodent and

human studies may come down to

what researchers ask these mothers

to do. For rats, the task is often to

remember where food is hidden.

Human studies, on the other hand,

often ask participants to memorize a

list to test their recall. “Maybe we need

more tests where we’re seeing how fast

moms can shop in the grocery store

or something like that, as opposed to

memorizing vocabulary words,” says

Lambert. “That’s just not at the top of

the list when you’ve got a baby.”

Instead, the top priority is the

baby. The shift from selish singleton

to seless parent is dramatic,

especially in rodents. Before a female

rat becomes pregnant, the smells

and sounds of pups repulse her.

As soon as she gives birth, though,

her newborns become her obsession.

Given the choice between being with

her babies or having free access to

cocaine, she’ll pick her pups — at least

until they’re big enough to hold their

own. Plus, a brain region associated

Mind

Over

Matter

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