What is the difference between psycopathy and sociopathy?

Based on my readings on the sociology of deviance, whether you describe someone who exhibits chronic disregard for others' rights/feelings, lack of empathy, total self-centeredness, etc. as "psychopathic" or "sociopathic" depends on whether you trace the cause of the behavior to intrapsychic or biological defects (psychopathic) or trace it to the social structure of a given society (sociopathic). Given that this kind of behavior is common in some types of societies and comparatively rare in others, I believe a strong case can be made for a social etiology.