Cognitive functioning
schizophrenia
Cognitive functioning was assessed by a trained research physician or a research psychologist, using three cognitive tests, the 15 Word Learning Test (WLT), the Continuous Performance Test (CPT) and the Verbal Fluency Test (VFT). Impairments on these tests were found in schizophrenia patients (Nuechterlein et al., First, the 15 WLT was used to assess memory function (Brand & Jolles, 