Cognitive dysfunction

The diagnostic criteria for schizophrenia specify negative and cognitive symptoms.^{[APA, 2013, pgs. 99 & 101]} These include diminution in aspects of memory, executive functioning, and processing.^{[APA, 2013, pg. 101]} Although an aspect of schizophrenia, it is noted that the cognitive dysfunction persists during periods when other symptoms are in remission, and so cognitive dysfunction can be considered alongside other persisting comorbidities.^{[APA, 2013, pg. 101]}

References:
American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. Fifth Edition (DSM-5™). © American Psychiatric Association, 2013.

Rund BR, Sundet K, Asbjørnsen A, et al. Neuropsychological test profiles in schizophrenia and non-psychotic depression. Acta Psychiatr Scand 2006; 113 (4): 350–359.

Fioravanti M, Bianchi V, Cinti ME. Cognitive deficits in schizophrenia: an updated metanalysis of the scientific evidence. BMC Psychiatry 2012; 12: 64.