The primary objective of this study was to test the hypothesis that treatment with LY2140023 compared to placebo, when added to a fixed dose of a standard of care (SOC) antipsychotic, would demonstrate significantly greater reduction of negative symptoms, as assessed by the 16-item Negative Symptom Assessment scale (NSA-16), in patients with schizophrenia. Patients included in this study were concurrently receiving 1 of 4 second generation antipsychotics (SGAs): aripiprazole, olanzapine, risperidone, or quetiapine.
