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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]
Focal means that it is limited to a focal zone in any lobe. [2] Focal cortical dysplasia is a common cause of intractable epilepsy in children and is a frequent cause of epilepsy in adults. There are three types of FCD with subtypes, including type 1a, 1b, 1c, 2a, 2b, 3a, 3b, 3c, and 3d, each with distinct histopathological features.
Lateral temporal lobe seizures arising from the temporal-parietal lobe junction may cause complex visual hallucinations. [2] In comparison to mesial 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 ]
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.
TMoA is generally characterized by reduced speech output, which is a result of dysfunction of the affected region of the brain. [1] The left hemisphere is usually responsible for performing language functions, although left-handed individuals have been shown to perform language functions using either their left or right hemisphere depending on ...
SD is a clinically defined syndrome but is associated with predominantly temporal lobe atrophy (left greater than right) and hence is sometimes called temporal variant FTLD (tvFTLD). [7] SD is one of the three variants of primary progressive aphasia (PPA), which results from neurodegenerative disorders such as FTLD or Alzheimer's disease .
Alzheimer’s UK says that FTD symptoms are “very different” to other more common types of dementia, such as day-to-day memory loss – adding that in the early stages of the disease, many ...
Seizures in the temporal lobe 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 ]