What is paroxysmal theta activity?

Paroxysmal rhythmic theta waves appearing during early stages of sleep have long been recognized in the EEGs of normal children. A similar pattern with intermixed spikes appears to have a different correlation. We called this pattern ‘hypnagogic paroxysmal spike wave activity’ or ‘hypnagogic PSW.’

What is generalized in EEG?

Generalized EEG abnormalities typically signify dysfunction of the entire brain, although such dysfunction may not be symmetric in distribution. Generalized patterns thus may be described further as maximal in one region of the cerebrum (eg, frontal) or in one hemisphere compared to the other.

What does generalized slowing on EEG mean?

Generalized background slowing indicates diffuse cerebral dysfunction, which, similar to focal slowing, is also not specific as to cause.

What does a generalized seizure look like on an EEG?

Seizure types include generalized tonic-clonic (GTC), absence, and myoclonic. Accordingly, EEG typically shows generalized spikes or sharp waves, 3-Hz or faster spike-wave complexes (SWCs; clinically associated with absence seizures), and polyspikes (clinically associated with myoclonic seizures).

Can an EEG detect narcolepsy?

The test can also be used to diagnose other disorders that influence brain activity, such as Alzheimer’s disease, certain psychoses, and a sleep disorder called narcolepsy.

Does cataplexy show up on an EEG?

Conclusions: In narcolepsy, the presence of cataplexy and HLA positivity are associated with EEG slowing during wakefulness and increased fast EEG activity during REM sleep, REM-related symptoms and disrupted nocturnal sleep in narcolepsy.

What is theta activity in the brain?

Theta activity is a type of brain activity classified by the frequency range of 4–8 Hz. It is associated with the behavioral states of alertness, attention, orientation, and working memory including the enhancement of cognitive and perceptual performances (Aftanas and Golocheikine, 2001; Stern et al., 2001).

Does an EEG show past seizure activity?

The likelihood of recording a seizure during a routine EEG is small. The EEG generally records brain waves between seizures, called interictal brain waves. These waves may or may not show evidence of seizure activity.

Do all seizures show up on EEG?

An EEG can usually show if you are having a seizure at the time of the test, but it can’t show what happens to your brain at any other time. So even though your test results might not show any unusual activity it does not rule out having epilepsy. Some types of epilepsy are very difficult to identify with an EEG.

What does narcolepsy look like on an EEG?

What does hypersynchronous paroxysmal Theta Theta bursts on EEG represent?

Cataplexy hypersynchronous paroxysmal theta bursts may represent medial prefrontal activity, associated in humans and rodents with reward-driven motor impulse, planning and conflict monitoring. narcolepsy with cataplexy, orexin/hypocretin, theta EEG activity, mouse models, childhood cataplexy

What is generalized paroxysmal fast activity in EEG?

Generalized paroxysmal fast activity in EEG: An unrecognized finding in genetic generalized epilepsy GPFA can be an unrecognized electrographic finding in patients with genetic generalized epilepsy. While GPFA remains an important diagnostic EEG feature for epileptic encephalopathy (Lennox-Gastaut syndrome) it is not specific for this diagnosis.

Does theta rhythm increase during C2 phase of EEG?

EEG amplitude then markedly increases during a ‘paradoxical sleep-like’ C2 phase, with a theta rhythm reported maximal over the hippocampal regions, sporadic REMs and muscle twitches. The final C3 phase shows mixed frequency EEG activity and lack of REMs and muscle twitches.

Do young patients with narcolepsy have abnormal paroxysmal theta EEG activity during cataplexy?

Taken together, this argues for the occurrence of abnormal paroxysmal theta EEG activity during cataplexy in young patients with narcolepsy. Independent video/EEG analysis of OXko/ko mice allowed us to examine the evolution of brain activity over cataplexy course.