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A seizure is a paroxysmal episode of symptoms or altered behavior arising from abnormal excessive or synchronous brain neuronal activity. [5] A focal onset seizure arises from a biological neural network within one cerebral hemisphere, while a generalized onset seizure arises from within the cerebral hemispheres rapidly involving both hemispheres.
In focal onset aware seizures, a small part of one of the lobes may be affected and the person remains conscious. This can often be a precursor to a larger focal onset impaired awareness seizure; in such cases, the focal aware seizure is usually called an aura. A focal impaired awareness seizure affects a larger part of the hemisphere and the ...
Temporal lobe epilepsy is the most common type of focal onset epilepsy among adults. [1] Seizure symptoms and behavior distinguish seizures arising from the mesial temporal lobe from seizures arising from the lateral (neocortical) temporal lobe. [2] Memory and psychiatric comorbidities may occur.
Thereafter, the seizure may or may not evolve into loss of consciousness and a generalized tonic–clonic seizure. [2] [1] In contrast to the auras in ecstatic seizures, most auras of seizures generally are unpleasant, including feelings of anxiety and fear (60%) as well as depression, while positive feelings are only rarely reported. [1]
Epileptic auras are subjective sensory or psychic phenomena due to a focal seizure, i.e. a seizure that originates from that area of the brain responsible for the function which then expresses itself with the symptoms of the aura. It is important because it makes it clear where the alteration causing the seizure is located.
Focal seizures affect a specific area of the brain, not both sides. [13] It may turn into a generalized seizure if the seizure spreads through the brain. [3] [13] [8] Consciousness may or may not be impaired. [3] [5] The signs and symptoms of these seizures depends on the location of the brain that is affected. Focal seizures usually consist of ...
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