Paranoia and anxiety: A cluster analysis in a non-clinical sample and the relationship with worry processes.

Background: Worry processes are implicated in paranoia and anxiety. However, clinical studies focused on patients with co-occurring paranoia and anxiety. As both paranoia and anxiety are distributed across clinical and non-clinical groups, an investigation on worry processes among non-clinical individuals will allow us to delineate the specific worry mechanisms in paranoia and anxiety respectively.

A cross-validation study of clustering of schizotypy using a non-clinical Chinese sample.

This study aimed to examine whether the same clusters of individuals with schizotypy as reported in Western samples are present in a Chinese sample. Cluster analysis was conducted on the responses of 418 individuals to the Chapman Psychosis-Proneness Scales. Results revealed that similar clusters of schizotypy exist in Chinese and Western samples, and that the emotional and neuropsychological symptoms they manifest are consistent with their cluster type.

A 3-year prospective study of neurological soft signs in first-episode schizophrenia.

Neurological soft signs are biological traits that underlie schizophrenia and are found to occur at higher levels in at-risk individuals. The expression of neurological soft signs may be modifiable during the onset of the first psychotic episode and the subsequent evolution of the illness and its treatment. This study investigates neurological soft signs in 138 patients with first-episode schizophrenia and tracks the expression of motor soft signs in the following 3 years.