Claim: Psychological horror often uses mystery elements and characters with unstable, unreliable, or disturbed psychological states to enhance the suspense and horror.
Evidence: The subgenre frequently overlaps with the related subgenre of psychological thriller , and it often uses mystery elements and characters with unstable , unreliable , or disturbed psychological states to enhance the suspense and horror of the setting and plot and to provide an overall unpleasant , unsettling , or distressing atmosphere.