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aging and depression -20% experience depression at some point during old age -more likely to commit suicide psychotic disorders in old people -schizo less common in older folks -high prevalence of delusional disorder delirium clouding of consciousness person has difficulty concentrating, focusing attention, and following an orderly sequence of thought -leads to illusions and misinterpretations -can be caused by fever, disease, head injury, stress, or stroke dementia marked by severe problems in memory and in at least one other cognitive function -ex. loss of language, personality change -sometimes caused by poor nutrition, brain disease, stroke, etc. Alzheimer's disease -most common form of dementia -around 5 million people have it -occurs after the age of 65 -begins with memory/attention lapses, difficulty in language. ends with trouble completing tasks and memories are forgotten neurofibrillary tangles twisted protein fibers within the cells of the hippocampus occur in all people as they age. may cause alzheimers senile plaques deposits of beta-amyloid protein that form in the spaces between cells in the hippocampus, cerebral cortex, and other brain areas -people w/ alzheimers have alot structural and biochem causes of Alzheimer's Disease -proteins involved in memory get deformed (beta amyloid-plaques and tau-tangles) -abnormal activity of acetylcholine and glutamate -imbalance of calcium -toxins such as zinc and lead vascular dementia/multi-infarct dementia dementia caused by a cerebrovascular accident, or stroke, which restricts blood flow to certain areas of the brain. pick's disease disorder that affects the frontal and temporal lobes that is similar to Alzheimer's Creutzfeldt-Jakob disease symptoms that include spasms of the body -caused by a slow acting virus Huntington's Disease an inherited progressive disease in which memory problems worsen over time -personality changes and mood swings -have movement problems too