centration, some disorganization in thought or behavior, excessive suspiciousness, anxi-
ety, social withdrawal, and disruption in sl eep-wake cycle. Impaired cognitive function
and negative symptoms are often observed. Neuroimaging variables distinguish cohorts
with attenuated psychosis syndro me from normal control coho rts with patterns similar to,
but less severe than, that observed in schi zophrenia. However, neuroimaging data is not
diagnostic at the individual level.
Prevalence
The prevalence of attenuated psychosis syndrome is unknown. Symptoms in Criterion A
are not uncommon in the non-help-seeking population, ranging from 8%–13% for hallu-