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The rarest type of conjoined twins is connected at the head.The case of craniophagus makes up only 2 percent of conjoined twins born alive.For 98 percent of all sets of conjoined twins, each person has their own separate and distinct thoughts and feelings.But in the case of a set of craniopagus twins, which occurs in only one in 2.5 million births, they share neural activity because their skulls are connected.Since infancy, Abby and Brittany had to learn how to coordinate with one another in order to perform simple tasks, such as clapping, crawling, and eating.
Conjoined twins are born from the same egg which does not fully separate once it’s fertilized.
The girls are developmentally delayed because they’re attached at the thalamus — a region of the brain that involves sensory perception and motor function.
The girls are still too young to investigate their neurological wiring, but from the MRI scans, doctors have determined this “thalamic bridge” links one sister’s sensory input to the other, creating a conscious loop.
They share a heart, making it nearly impossible to surgically separate them without one or both twins dying.
Roughly 40 percent of all conjoined twins are thoracopagus.
Experts aren’t sure why, but females are three times as likely to survive than male conjoined twins, which is why 70 percent of all living conjoined twins are females.