“…blunted affect, emotional withdrawal) are associated with impairment of perceptual accuracy. This result was expected, as the PTI1 and 2 criteria are derived from X-% variable, and "[…] high X-% subjects are at risk of self-injurious behaviors, unintentionally harmful to themselves or others, and they are likely to be seen as strange, peculiar, erratic, or incomprehensive […]" (Weiner, 1998). Therefore, the PTI1 and PTI2 variables could represent a valid clinical tool to evaluate the presence of the negative symptoms, especially in the early, often subclinical, stages of psychosis.…”