This review examines the structural validity of negative symptoms focusing on 2
questions:(1) Do negative symptoms represent a domain separate from other symptoms in …

Negative symptoms of schizophrenia are normally grouped into a single category. However,
the diversity of such symptoms suggests that they are actually made up of more than one …

OBJECTIVE: The aim of this study was to test the goodness-of-fit of all previously published
five-factor models of the Positive and Negative Syndrome Scale (PANSS). METHODS: We …

Method: 60 patients with DSM-IV schizophrenia or schizoaffective disorder participated in an
8-week, double-blind, randomized, placebo-controlled study. 400 mg/d of L-theanine was …

Negative symptoms have emerged as a replicable factor of symptomatology within
schizophrenia. Although rating scales provide assessments along dimensions of severity …

In the last 25 years, the Positive and Negative Syndrome Scale (PANSS) has been largely
used to assess schizophrenia symptom intensity, but little information is available on how …

The heterogeneity of schizophrenic symptomatology is well documented. The positive–
negative distinction is limited to cover the entire spectrum of schizophrenic psychopathology …

The Positive and Negative Syndrome Scale (PANSS) is the most widely used instrument to
assess the severity of symptoms of schizophrenia. Most studies have showed that PANSS …

Objectives: l-Theanine (γ-glutamylethylamide) augmentation to antipsychotic therapy
ameliorates positive, activation, and anxiety symptoms in schizophrenia and schizoaffective …

Considering the widespread use of the Positive and Negative Syndrome Scale (PANSS)
and its factors around the world in clinical trials, it is clearly necessary to perform a …