AP Photo/Rick Bowmer
The term was coined after a 1973 bank robbery in Sweden spurred bank employees to bond with and eventually defend their captors. In America, Stockholm Syndrome was made famous by Patty Hearst, an heiress who joined the violent left-wing group that kidnapped her.
Some experts speculated that Smart had Stockholm, too, even though the disorder has rarely been studied and isn't listed in the DSM V, the bible of psychiatric disorders. One of the few academic studies on Stockholm Syndrome concludes that there's hardly any academic research on the subject.
"There is very little evidence to sort of validate that Stockholm Syndrome exists," Emory University clinical psychologist Nadine Kaslow told Business Insider. She added, "It is mostly talked about in the media."
Smart's
''The captor also becomes the nurturer," child psychologist Dr. Arthur Brand told the Times. "They're an abuser, but also the only person who can take care of you and keep you alive."
The FBI's
"Smart argues that you don't need to have affection for a captor in order to be compliant - fear is enough," Talbot writes in her profile of Smart. Throughout her captivity, Talbot notes, her kidnapper Brian David Mitchell threatened to kill her or her family if she tried to run away.
That fear might make it look like kidnap victims are complying with their captors when they're really just paralyzed, Kaslow told BI. "The reality is that people are often traumatized and terrorized," Kaslow said, "and so they may not call out because they're too afraid."