Researchers from Vrije Universiteit Amsterdam and Radboud University Nijmegen found proof that psychopathic individuals can feel fear, but have trouble in the automatic detection and responsiveness to threat.
The evidence for impairments in brain areas involved in the experience of fear was less consistent than is often assumed, indicating that the experience of fear may not be completely impaired in psychopathy.
The researchers then conclusively showed that psychopathic individuals have trouble in the automatic detection and responsiveness to threat but may in fact feel fear, providing direct empirical support for the claim that the conscious experience of fear may not be impaired in these individuals.
https://www.psypost.org/2016/08/psychopaths-feel-fear-but-see-no-danger-study-finds-44704