Psychopaths do not lack empathy, rather they can switch it on at will, according to new research....
Christian Keysers from the University of Groningen, the Netherlands, and senior author of the study, said it could change the way psychopathic criminals were viewed.
"The predominant notion had been that they are callous individuals, unable to feel emotions themselves and therefore unable to feel emotions in others.
"Our work shows it's not that simple. They don't lack empathy but they have a switch to turn it on and off. By default, it seems to be off."
The fact that they have the capacity to switch empathy on, at least under certain conditions, could have a positive side to it, Prof Keysers said.
"The notion psychopaths have no empathy at all was a bleak prospect. It would make it very hard for them to have normal moral development
"Now that we've shown they have empathy - even if only in certain conditions - we can give therapists something to work with," Prof Keysers told BBC News.
But he explained that it remained unclear how this wilful capacity for empathy could be transformed into the spontaneous empathy most of us have.
BBC News
Psychopathic criminals have empathy switch
Melissa Hogenboom | Science reporter