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In neurology, semantic dementia (SD), also known as semantic variant primary progressive aphasia (svPPA), is a progressive neurodegenerative disorder characterized by loss of semantic memory in both the verbal and non-verbal domains. However, the most common presenting symptoms are in the verbal domain (with loss of word meaning).
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]
Tangential speech or tangentiality is a communication disorder in which the train of thought of the speaker wanders and shows a lack of focus, never returning to the initial topic of the conversation. [1]
Verbal overshadowing is a phenomenon where giving a verbal description of sensory input impairs formation of memories of that input. This was first reported by Schooler and Engstler-Schooler (1990) where it was shown that the effects can be observed across multiple domains of cognition which are known to rely on non-verbal knowledge and perceptual expertise.
Semantic dementia [23] is a condition in which words and phrases slowly begin to lose meaning, and comprehension is lost because of a deterioration in the semantic memory. This is usually characterized by behavior changes, fluent speech but with no meaning, preserved syntax and grammar, and the impaired ability to recognize objects.
The alternative meaning of alogia is inability to speak because of dysfunction in the central nervous system, [10] [3] found in mental deficiency and dementia. [ 11 ] [ 3 ] In this sense, the word is synonymous with aphasia , [ 3 ] and in less severe form, it is sometimes called dyslogia.
Furthermore, the definition of Alzheimer's disease expanded to include earlier, non-dementia, stages. So now, MCI can either be a diagnosis associated with early Alzheimer's disease (i.e., people with MCI that also have Alzheimer's disease) or a diagnosis of cognitive decline due to a cause other than Alzheimer's disease; it is no longer ...
Alzheimer's disease is a condition with both neurological and psychological components. It is a form of dementia associated with severe frontal lobe dysfunction. Confabulation in individuals with Alzheimer's is often more spontaneous than it is in other conditions, especially in the advanced stages of the disease.
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