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It is suspected that an atypical form of Alzheimer's disease is the most common cause of logopenic progressive aphasia. [3] [4] Although patients with the logopenic variant of PPA are still able to produce speech, their speech rate may be significantly slowed due to word retrieval difficulty. [4]
[4] [6] This is termed poverty of content [4] or poverty of content of speech. [6] Under Scale for the Assessment of Negative Symptoms used in clinical research, thought blocking is considered a part of alogia, and so is increased latency in response. [7] This condition is associated with schizophrenia, dementia, severe depression, and autism.
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]
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.
[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]
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]
Palilalia also occurs in a variety of neurological disorders, occurring most commonly in Tourette syndrome, Alzheimer's disease, and progressive supranuclear palsy. [5] Such degradation can occur in the substantia nigra where decreased dopamine production results in a loss of function. [ 4 ]
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