Methodological and interpretive constraints resulting from the use of the Per-Mag classification in high-risk...

It has previously been argued that the current Per-Mag classification criteria may erroneously select some individuals who are not vulnerable to psychosis. We suggest that a second false-positive problem exists with these criteria. Specifically, actively psychotic individuals may be included in presumably prepsychotic samples. Implications of this problem for at-risk information-processing research are discussed.