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The World's Rarest Twins

Sisters Krista and Tatiana Hogan are connected in more ways than one. Here's a look into the lives—and futures—of Canada's only craniopagus twins
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The World's Rarest Twins
Krista and Tatiana Hogan on their second birthday Brian Howell

Sisters Krista and Tatiana Hogan are connected in more ways than one. Here's a look into the lives—and futures—of Canada's only craniopagus twins

The moment they were born, on October 25, 2006, in Vancouver, this much was known about Krista and Tatiana Hogan. The girls were conjoined—what used to be called “Siamese”—twins. Their skulls were fused such that their tiny bodies together made the shape of an open hinge, the girls facing the same direction but essentially away from each other. Each had her own organs and limbs, but they shared plenty of blood vessels in the netlike sheath beneath their scalp. And they shared something else, too, something believed to be unprecedented among living twins: a “bridge” of tissue connected their otherwise-separate brains amidships, at a crucial relay station called the thalamus.

Eight hours after the twins’ birth, a remarkable thing happened, and it immediately transformed the story of two little girls from Vernon, B.C., into something almost mythic. Tatiana got a shot and Krista flinched. Clearly, the girls were not just attached but connected. Sensory information passed between them.

“This is not telepathy. This is not ‘sixth sense,” says Douglas Cochrane, a veteran pediatric neurosurgeon at BC Children’s Hospital who has been the twins’ wingman—their doctor, advocate, and, in a sense, protector—since they were in utero. “The girls send chemical messengers in the bloodstream between each other. They send electrical impulses and information between each other along this bridge”—on the CT-scan image he’s pointing to, it looks like a long kidney bean—“and I’m sure along the coverings that they share.”

The bridge has been likened to a FireWire connection between their brains, and its bandwidth appears broad. Months after their birth, tests confirmed that images falling on the retina of Tatiana were processed in the visual cortex of Krista. What one girl looks at, the other girl sees.

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