Classifications
In the Diagnostic and Statistical Manual of Mental Disorders ( DSM-IV-TR), which describes 250 disorders and their symptoms, cognitive disorders are classified under a psychological disorder in axis I. It is described as disorders with “a significant impairment of cognition or memory that represents a marked deterioration from a previous level of function”. The three main areas outlined by the DSM-IV-TR of cognitive disorders are delirium, dementia, and amnesia. There are many sub categories in each of these areas as well.
Read more about this topic: Cognitive Disorder