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  2. Alzheimer's disease - Wikipedia

    en.wikipedia.org/wiki/Alzheimer's_disease

    Alzheimer's disease (AD) is a neurodegenerative disease that usually starts slowly and progressively worsens, [2] and is the cause of 60–70% of cases of dementia. [2][15] The most common early symptom is difficulty in remembering recent events. [1] As the disease advances, symptoms can include problems with language, disorientation (including ...

  3. Dementia - Wikipedia

    en.wikipedia.org/wiki/Dementia

    Dementia is a syndrome associated with many neurodegenerative diseases, characterized by a general decline in cognitive abilities that affects a person's ability to perform everyday activities. This typically involves problems with memory, thinking, behavior, and motor control. [10]

  4. Mirrored-self misidentification - Wikipedia

    en.wikipedia.org/wiki/Mirrored-self...

    Mirrored-self misidentification is the delusional belief that one's reflection in the mirror is another person – typically a younger or second version of one's self, a stranger, or a relative. [1] This delusion occurs most frequently in patients with dementia [2] and an affected patient maintains the ability to recognize others' reflections ...

  5. Semantic dementia - Wikipedia

    en.wikipedia.org/wiki/Semantic_dementia

    Semantic dementia. 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 ...

  6. Biomarkers of Alzheimer's disease - Wikipedia

    en.wikipedia.org/wiki/Biomarkers_of_Alzheimer's...

    The biomarkers can be used to diagnose Alzheimer's disease (AD) in a very early stage, but they also provide objective and reliable measures of disease progress. It is imperative to diagnose AD disease as soon as possible, because neuropathologic changes of AD precede the symptoms by years. [1] It is well known that amyloid beta (Aβ) is a good ...

  7. Neurodegenerative disease - Wikipedia

    en.wikipedia.org/wiki/Neurodegenerative_disease

    A neurodegenerative disease is caused by the progressive loss of neurons, in the process known as neurodegeneration. [2][3] Neuronal damage may also ultimately result in their death. Neurodegenerative diseases include amyotrophic lateral sclerosis, multiple sclerosis, Parkinson's disease, Alzheimer's disease, Huntington's disease, multiple ...