The author introduced the past and current research that focuses on cognitive function in schizophrenia. Based on a comprehensive clinical neuropsychological examination, it was determined that schizophrenia has a background involving a wide range of cognitive dysfunctions. In particular, it is suggested that there is a substantial problem in memory and in processing speed. Furthermore, there are also problems with both attention and execution functions. The recent memory impairments in schizophrenia were not the same as that observed in amnesia. Aspects of memory organization and memory strategy have been characterized and have resulted in intervention methods to improve cognitive impairment with positive and verifiable effects. Improvement after cognitive remediation therapy seems to lead to improved social adaptation, and the therapeutic approach will likely become more popular with additional studies.
