I'd like to have some source on this.

At the moment I didn't find good sources so I opened a Stackoverflow question.

Ironically, various group therapy sessions with neurotypical people in the group solve this problems for psychopaths, because they get enough data so they can better fake having the usual feelings.

That's true for standard group therapy where people just pay attention to the words that are spoken and how they are spoken. As a result standard group therapy done in prisons seems to raise

On the other hand it's very hard to fake emotions when hugging another person who is perceptive because the person can use their hands to feel what's going on inside your body. A person is effectively exposed in a good hug.