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It is defined clinically by impairments in naming and sentence repetition. [2] It is similar to conduction aphasia and is associated with atrophy to the left posterior temporal cortex and inferior parietal lobule. It is suspected that an atypical form of Alzheimer's disease is the most common cause of logopenic progressive aphasia. [3] [4]
[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 ]
This is termed poverty of speech [4] or laconic speech. [5] The amount of speech may be normal but conveys little information because it is vague, empty, stereotyped, overconcrete, overabstract, or repetitive. [4] [6] This is termed poverty of content [4] or poverty of content of speech. [6]
Researchers have developed an AI tool that can predict with nearly 80% accuracy whether someone is at risk for developing Alzheimer’s disease based on their speech patterns.
The Boston Naming Test (BNT), introduced in 1983 by Edith Kaplan, Harold Goodglass and Sandra Weintraub, is a widely used neuropsychological assessment tool to measure confrontational word retrieval in individuals with aphasia or other language disturbance caused by stroke, Alzheimer's disease, or other dementing disorder. [1]
Aphasia, also known as dysphasia, [a] is an impairment in a person’s ability to comprehend or formulate language because of damage to specific brain regions. [2] The major causes are stroke and head trauma; prevalence is hard to determine, but aphasia due to stroke is estimated to be 0.1–0.4% in developed countries. [3]
Expressive aphasia (also known as Broca's aphasia) is a type of aphasia characterized by partial loss of the ability to produce language (spoken, manual, [1] or written), although comprehension generally remains intact. [2] A person with expressive aphasia will exhibit effortful speech.
It is less severe than logorrhea and may be associated with the middle stage in dementia. [1] It is, however, more severe than circumstantial speech, in which the speaker wanders but eventually returns to the topic. [3] Some adults with right hemisphere brain damage may exhibit behavior that includes tangential speech. [4]