What is spike and wave in EEG?
Spike-and-wave is a pattern of the electroencephalogram (EEG) typically observed during epileptic seizures. A spike-and-wave discharge is a regular, symmetrical, generalized EEG pattern seen particularly during absence epilepsy, also known as ‘petit mal’ epilepsy.
What does 3 Hz spike and wave mean?
3 Hz and spike-wave: These are typical for absence seizures but can also occur in other types of generalized seizures. The waking background EEG activity is normal.
What is Spike waveform?
Spike sorting is a class of techniques used in the analysis of electrophysiological data. Spike sorting algorithms use the shape(s) of waveforms collected with one or more electrodes in the brain to distinguish the activity of one or more neurons from background electrical noise.
What is spike sorting and why is it necessary?
Spike sorting refers to the process of assigning spikes to different neurons. Since the spike shapes are unique and quite reproducible for each neuron they can be used to distinguish spikes produced by different neurons, i.e. to separate the activity produced by each.
Why is Spike sorting important?
Spike sorting is a crucial step to extract information from extracellular recordings. With new recording opportunities provided by the development of new electrodes that allow monitoring hundreds of neurons simultaneously, the scenario for the new generation of algorithms is both exciting and challenging.
How do EEG electrodes work?
During an EEG, small electrodes and wires are attached to your head. The electrodes detect your brain waves and the EEG machine amplifies the signals and records them in a wave pattern on graph paper or a computer screen (Fig. A sample EEG recording showing a focal spike typical of a seizure.
How are EEGS performed?
An EEG tracks and records brain wave patterns. Small metal discs with thin wires (electrodes) are placed on the scalp, and then send signals to a computer to record the results. Normal electrical activity in the brain makes a recognizable pattern.
What is the frequency of slow spike and wave discharge?
The slow spike-and-wave or sharp-and-slow-wave complexes consist of generalized discharges occurring at a frequency of 1.5 to 2.5 Hz. The morphology, amplitude, and repetition rate may vary both between bursts and during paroxysmal bursts of spike-and-wave activity, and asymmetries of the discharge are frequent.
What is ictal generalized spike-and-wave?
Ictal Generalized spike-and-wave is mandatory. Regular 3 Hz generalized spike-and-wave occurs with typical absence seizures in childhood absence epilepsy. In absence seizures beginning in adolescence, faster irregular 3.5-6 Hz generalized spike-and-wave and polyspike-and-wave occurs.
What is the frequency of Spike-and-wave epilepsy?
Regular 3 Hz generalized spike-and-wave occurs with typical absence seizures in childhood absence epilepsy. In absence seizures beginning in adolescence, faster irregular 3.5-6 Hz generalized spike-and-wave and polyspike-and-wave occurs.
Do I have epilepsy if my EEG shows 3 Hz spikes?
If your EEG shows 3 Hz spike-wave activity, then you have a predisposition, likely genetic, to having certain types of epilepsy. However, unless you actually have seizures, you do not have epilepsy.