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[1] [2] [3] Semantic dementia is a disorder of semantic memory that causes patients to lose the ability to match words or images to their meanings. [4] However, it is fairly rare for patients with semantic dementia to develop category specific impairments, though there have been documented cases of it occurring. [5]
Alzheimer's disease is a subcategory of semantic dementia which can cause similar symptoms. The main difference between the two is that Alzheimer's is categorized by atrophy to both sides of the brain, while semantic dementia is categorized by loss of brain tissue in the front portion of the left temporal lobe. [54]
One study examined dementia severity in elderly schizophrenic patients diagnosed with Alzheimer's disease and dementia versus elderly schizophrenic patients without any neurodegenerative disorders. In most cases, if schizophrenia is diagnosed, Alzheimer's disease or some form of dementia in varying levels of severity is also diagnosed.
There is a difference between cortical and subcortical dementia. Cortical dementia is atrophy of the cortex which affects ‘higher’ functions such as memory, language, and semantic knowledge whereas subcortical dementia affects mental manipulation, forgetfulness, and personality/emotional changes.
FTD is traditionally difficult to diagnose owing to the diverse nature of the associated symptoms. Signs and symptoms are classified into three groups based on the affected functions of the frontal and temporal lobes: [8] These are behavioural variant frontotemporal dementia, semantic dementia, and progressive nonfluent aphasia. An overlap ...
Once you get an evaluation, a doctor will usually order a blood test to check for a vitamin B12 deficiency, along with other potential factors that could cause dementia-like symptoms, Sachdev says.
The three clinical subtypes of frontotemporal lobar degeneration, frontotemporal dementia, semantic dementia and progressive nonfluent aphasia, are characterized by impairments in specific neural networks. [17] The first subtype, frontotemporal dementia, mainly affects a frontomedian network and impairs social cognition.
A new study found a link between processed red meat and dementia risk but suggests nuts and legumes had a protective effect. Stefa Nikolic/Getty Images ... a key cause of dementia development ...
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