Affective symptoms in early-onset dementia.

The phenotypic expression of neuropsychological deficits can have very different genotypic etiologies. Understanding the causes of various neuropsychological deficits is tantamount in developing the appropriate treatments. The literature on mood disorders as a risk factor for dementia is reviewed as well as common neuropsychological patterns in dementia and mood disorders. A brief discussion on chronic traumatic encephalopathy is provided.