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Alzheimer's disease does not affect all memory capacities equally. Older memories of the person's life (episodic memory), facts learned (semantic memory), and implicit memory (the memory of the body on how to do things, such as using a fork to eat or how to drink from a glass) are affected to a lesser degree than new facts or memories. [42] [43]
The most common symptoms of Alzheimer's disease are short-term memory loss and word-finding difficulties. Trouble with visuospatial functioning (getting lost often), reasoning, judgment and insight fail. Insight refers to whether or not the person realizes they have memory problems. The part of the brain most affected by Alzheimer's is the ...
The diagnosis of Alzheimer's disease typically requires a microscopic analysis of plaques and tangles in brain tissue, usually at autopsy. [40] However, Aβ plaques (along with cerebral Aβ-amyloid angiopathy ) can be detected in the brains of living subjects by preparing radiolabeled agents that bind selectively to Aβ deposits in the brain ...
The study found that increased levels of both amyloid-beta and tau proteins in the brain may lead to changed brain activity before the cognitive symptoms of Alzheimer’s disease appear. Focusing ...
Dementia directly affects more than 55 million people worldwide, and up to 70% of those people have Alzheimer’s disease, which is characterized by a loss of brain cells associated with the toxic ...
Diffuse Lewy body disease, dementia due to Lewy body disease: Microscopic image of a Lewy body (adjacent to arrowhead) in a neuron of the substantia nigra; scale bar=20 microns (0.02 mm) Specialty: Neurology, psychiatry: Symptoms: Dementia, abnormal behavior during REM sleep, fluctuations in alertness, visual hallucinations, parkinsonism [1 ...