"Study reveals psychopathic women have diminished cardiac defense responses"

A new study published in Biological Psychology has found that women with high scores in the psychopathic trait of fearlessness exhibit reduced heart rate changes when faced with an intense and unexpected stimulus, while this relationship was not found among men. The study suggests that the heart's response to threat could be a useful way to study fearlessness in psychopathy and understand gender differences in this trait. However, the study has limitations, including a small sample size and the use of self-report measures of psychopathy.