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Neuroleptic: The term Neuroleptic refers to a class of psychiatric medicines that are used to treat psychosis and a variety of other conditions. Classical members of this category include Thorazine and Haldol. Although, it would be tempting to substitute the term "Anti-Psychotic" here, it should be noted that there are many instances where a psychiatrist will use medicines originally intended for the treatment of psychosis for the treatment of other mental disorders with good effect.
Neuropsychology: Neuropsychology is a joint field of clinical psychology and neuroscience. Neuropsychologists study the relationships between the brain and the behaviour. Many of them are experts in psychological testing, particularly in intellectual and cognitive tests of intelligence, memory and attention.
Neurotic: There are two levels of mental illness severity: less impaired (Neurosis) and more impaired (Psychosis). In Neurosis, a person has many internal psychological conflicts and shows mild to moderate impairments in their ability to "Love and Work" properly. Neurotics, however maintain contact with shared social reality. Psychosis was thought of as a state of severe psychological impairment where shared social reality was lost.
Neurotransmitters: Neurotransmitters are the name given to a group of chemicals in people's brain that are critical parts of how the brain works.
Obsessive-Compulsive Disorder (OCD): Obsessive-Compulsive Disorder is a serious mental disorder characterized by the presence of obsessions and compulsions. Obsessions are repetitive, unwanted thoughts. People's obsessive thoughts take different forms but frequently center on themes about personal vulnerability and loss of control (whether or not they locked their door, turned off their stove or were contaminated by germs). Often there is a sense of urgency and tension that rises until the person feels compelled to act on the obsessive thought. An action based on an obsessive thought is called a compulsion. Acting out a compulsion does not stop the obsession in most cases, except on a temporary basis. Compulsions often need to be acted upon continually in a never-ending cycle. Compulsions range from mild checking behaviour (to see if your door is locked, stove is off etc.) to severe cases where the person is unable to function based on their compulsions having taken over their life.
Organic Disorders: The term 'Organic' as used in medicine and mental health refers to disorders that are based in physical or neurological (usually brain) injury or damage.
Psychiatrist: A Psychiatrist is a Medical Doctor or Physician who has completed medical school and also a multi-year residency in Psychiatry (treatment of mental illness).
Psychologist: A Psychologist is an individual who has completed a doctoral level degree (about 5 years of graduate school resulting in the Ph.D. or Psy.D. degrees) in the science of Psychology - the study of how individuals behave, think, feel, know etc. Psychology is a very diverse discipline; some psychologists are scientist-researchers, some are therapists, some become administrators, etc.
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