The participants recruited in this study were: (a) diagnosed with schizophrenia and symptoms of auditory hallucinations according to the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV); (b) without intellectual disability or organic brain syndromes; (c) on regular antipsychotic medication for more than 3 months; (d) willing to participate in the study and sign an informed consent document; and (e) literate and without verbal communication problems.