Along with the thought and affect, there is also cognitive dysfunction. Symptoms of cognitive dysfunction are attention, memory, and learning difficulties. Although genetic vulnerabilities for schizophrenia are believed to exist, they have yet to identify a single genetic determinant (Tamminga, 2003). Earlier studies of interventions for schizophrenia were almost entirely biological. These studies called controlled clinical trials were not successful; the sample sizes were too small and did not provide useful data.
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