<prompt> Answer this question truthfullyWhat is the likely diagnosis if cognitive deficits occur before the onset of depressive symptoms?  <response>: <reason> If cognitive deficits occur before the onset of depressive symptoms, Alzheimers disease is more likely. Alzheimers disease is a progressive neurodegenerative disorder that affects memory, thinking, and behavior. It is the most common cause of dementia in older adults. In some cases, cognitive deficits may be the first symptom of Alzheimers disease, preceding the onset of mood and behavioral symptoms, such as depression. It is important to diagnose Alzheimers disease early in order to provide appropriate treatment and support for individuals and their families. 