(IPA: /sa?'k?p??i/) is a psychological construct that describes chronic immoral and antisocial behavior. The term is often used interchangeably with sociopathy. Psychopathy has been the most studied of any personality disorder. Today the term can legitimately be used in two ways. One is in the legal sense, 'psychopathic personality disorder' under the Mental Health Act 1983 of the UK. The other use is as a severe form of the antisocial or dissocial personality disorder as exclusively defined by the Psychopathy Checklist-Revised (PCL-R). The term 'psychopathy' is often confused with psychotic disorders. It is estimated that approximately one percent of the general population are psychopaths. They are overrepresented in prison systems, politics, law enforcement agencies, law firms, and in the media. The psychopath is defined by a psychological gratification in criminal, sexual, or aggressive impulses and the inability to learn from past mistakes. Using Freudian terminology, the psychopathic personality occurs when the ego can't mediate between the id and the super-ego, thus allowing the id to run off the pleasure principle, and the super-ego has no control over the actions of the ego. In other words, individuals with this disorder gain satisfaction through their antisocial behavior as well as lacking a conscience. Psychopathy is frequently co-morbid with other psychological disorders (particularly narcissistic personality disorder). The psychopath differs slightly from the sociopath, and may differ even more so from an individual with an antisocial personality disorder diagnosis. Nevertheless, the three terms are frequently used interchangeably. While nearly all psychopaths have antisocial personality disorder, only some individuals with antisocial personality disorder are psychopaths. Many psychologists believe that psychopathy falls on a spectrum of pathological narcissism, ranging from narcissistic personality disorder on the low end, malignant narcissism in the middle, and psychopathy on the high end. An almost all-pervasive misconception is that psychopaths are doomed to a life of violence and crime; however, it is possible for psychopaths to become successful in many lines of work. Psychopathy is frequently mistaken with other similar personality disorders, such as dissocial personality disorder, narcissistic personality disorder, and schizoid personality disorder (as well as others). It is also important to note that psychopathy is a syndrome or a psychological construct, while antisocial personality disorder is a diagnosis.