The definitions here are not intended to be exhaustive, but provide a little thumb-nail picture only.

Psychopath (psychopathy): A condition characterized by a lack of conscience, lack of empathy, lack of shame or guilt, and a high degree of interpersonal charm. Famous persons suspected of being psychopaths include Charles Manson, Jeffrey Dohmer, John Wayne Gacy, Jr., and Ted Bundy. Today, this condition is called Antisocial Personality Disorder.
Sociopath (sociopathy): Same as the above. The difference between psychopathy and sociopathy is based on the speaker's theory of cause. Psychopaths are born; sociopaths are made (by parental neglect, poverty, etc.). This condition is also called Antisocial Personality Disorder today.
Psychotic (psychosis): This term is still in limited use. This is an umbrella term that encompasses both hallucinations and delusions. Hallucinations are sensory experiences that are not real; delusions are false, fixed beliefs. Famous persons believed to be psychotic include John Hinckley, Jr. and Mary Todd Lincoln.
Psychoneurotic (psychoneurosis/neurosis): This term was popularized by Sigmund Freud and Carl Jung. In includes many, many conditions that are not psychotic, including anxiety, depression, and psychosomatic disorders. Famous persons believed to be neurotic include Woody Allen and Howard Hughes.
The American Psychiatric Association made an attempt at standardizing diagnoses in 1952 with the publication of the Diagnostic and Statistical Manual. The third edition (DSM-III), published in 1980, was the edition that brought reliability to the terms. The next edition (DSM-V), after many delays, is scheduled to be published in 2012.
The following website:
www.DSM5.org
is scheduled to launch on Feb 10, 2010 to provide current news on DSM-V development.
Under DSM-V rules, it now appears that ratings of depression, anxiety, cognitive impairment, and reality distortion will be part of all diagnoses. This will replace current diagnoses such as Schizoaffective Disorder, a condition in which mood symptoms co-occur with symptoms of Schizophrenia.
Possible future diagnoses will include:
Complex Post Traumatic Stress Disorder (C-PTSD), a condition that involves a loss of sense of self after prolonged captivity.
Post Traumatic Embitterment Disorder (PTED), a chronic feeling of embitterment and injustice following a single, negative event.
Relational Disorders, including Marital Relational Disorder with/without Violence and Parent-Child Abuse Disorder, will make domestic violence and child abuse issues that may be addressed by psychiatrist. This would be one of many controversial decisions, in this case possibly turning a crime into a disorder.






