The<unk>  or the<unk>  is a medical<unk>  used for measuring symptom severity of patients with schizophrenia.  It is widely used in the study of antipsychotic therapy.  The name refers to the two types of symptoms in schizophrenia, as defined by the American Psychiatric Association:<unk>  symptoms, which refer are an excess or distortion of normal functions, and<unk>  symptoms, which represent a dimunition or loss of normal functions.
Positive and Negative Syndrome Scale
Epworth Sleepiness Scale
Structured Clinical Interview for DSM-IV
Mini mental state examination
Applied behavior analysis
Abbreviated mental test score
Yale-Brown obsessive compulsive scale
Cognitive neuropsychology