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Men and women appear to be equally affected. [1] FTD generally presents as a behavioral or language disorder with gradual onset. [ 4 ] Signs and symptoms tend to appear in late adulthood, typically between the ages of 45 and 65, although it can affect people younger or older than this. [ 1 ]
Focal neurological deficits may be caused by a variety of medical conditions such as head trauma, [1] tumors or stroke; or by various diseases such as meningitis or encephalitis or as a side effect of certain medications such as those used in anesthesia. [2] Neurological soft signs are a group of non-focal neurologic signs. [3]
Lateral temporal lobe seizures arising from the temporal-parietal lobe junction may cause complex visual hallucinations. [2] In comparison to medial temporal lobe seizures, lateral temporal lobe seizures are briefer duration seizures, occur with earlier loss of awareness, and are more likely become a focal to bilateral tonic-clonic seizure. [ 2 ]
Geschwind syndrome, also known as Gastaut–Geschwind syndrome, is a group of behavioral phenomena evident in some people with temporal lobe epilepsy.It is named for one of the first individuals to categorize the symptoms, Norman Geschwind, who published prolifically on the topic from 1973 to 1984. [1]
A focal impaired awareness seizure affects a larger part of the hemisphere and the person may lose consciousness. If a focal seizure spreads from one hemisphere to the other side of the brain, this will give rise to a focal to bilateral seizure. [5] [6] The person will become unconscious and may experience a tonic–clonic seizure.
Many diseases that cause cerebral atrophy are associated with dementia, seizures, and a group of language disorders called the aphasias. Dementia is characterized by a progressive impairment of memory and intellectual function that is severe enough to interfere with social and work skills.
Mild cognitive impairment (MCI) may be caused due to alteration in the brain triggered during early stages of Alzheimer's disease, to other causes, or to a combination of causes. [14] [15] Brain damage, brain injury, delirium and prolonged substance abuse can cause MCI. HIV-associated neurocognitive disorder can cause MCI. Risk factors of both ...
Semantic dementia is mainly related to the inferior temporal poles and amygdalae; brain regions that have been discussed in the context of conceptual knowledge, semantic information processing, and social cognition, whereas progressive nonfluent aphasia affects the whole left frontotemporal network for phonological and syntactical processing.