Spikes or sharp waves are terms commonly seen in EEG reports. If these happen only once in a while or at certain times of day, they may not mean anything. If they happen frequently or are found in specific areas of the brain, it could mean there is potentially an area of seizure activity nearby.

What does a spike mean on an EEG?

Spikes or sharp waves are terms commonly seen in EEG reports. If these happen only once in a while or at certain times of day, they may not mean anything. If they happen frequently or are found in specific areas of the brain, it could mean there is potentially an area of seizure activity nearby.

What is a spike-and-wave event oscillation?

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 is Spike wave discharges?

Spike and wave discharges (SWDs) are the electrographic hallmark of typical absence seizures, and their presence in the EEG of children serves as major diagnostic criterion for absence epilepsy (Panayiotopoulos, 1999; Sitnikova & van Luijtelaar, 2007).

What does an EEG spike look like?

Spikes are very fast waves and are called spikes because of their shape on the EEG. Each lasts less than 80 milliseconds (less than 1/12th of a second) and may be followed by slow delta waves. Spikes clearly stand out from other brain activity on the EEG. Polyspikes are a series of spikes that happen quickly.

What does Persyst seizure detection mean?

The Persyst Seizure Detector neural network uses a wide range of inputs from the EEG in order to determine the probability that the data in a particular segment represents an electrographic seizure. These inputs include the background activity, Artifact Reduction, Rhythmicity, Amplitude, Symmetry, and many more.

What is the signal amplitude range of EEG?

about 10 µV to 100 µV
A typical adult human EEG signal is about 10 µV to 100 µV in amplitude when measured from the scalp. Since an EEG voltage signal represents a difference between the voltages at two electrodes, the display of the EEG for the reading encephalographer may be set up in one of several ways.

What is a normal EEG?

Most waves of 8 Hz and higher frequencies are normal findings in the EEG of an awake adult. Waves with a frequency of 7 Hz or less often are classified as abnormal in awake adults, although they normally can be seen in children or in adults who are asleep.

Can you have an abnormal EEG and not have seizures?

To complicate this further, some people have ‘abnormal’ EEGs but do not have epilepsy. Also, many people who do have epilepsy will only have ‘abnormal’ activity on the EEG if they have a seizure at the time the test is happening.

What is the relationship between frequency amplitude and wavelength?

Frequency is the number of waves passing through a point per second. Amplitude is the maximum displacement of a wave from its rest position. Wavelength is the distance between two adjacent crests or troughs in a wave. A wave is a disturbance or a vibration that is transmitted through a medium or vacuum.

What is the wavelength of a wave?

The wavelength is the distance between two adjacent crests or troughs in a wave. The image shows the crest, trough, wavelength, and amplitude of a transverse wave. Waves are described in terms of its wavelength, amplitude and frequency. Got a question on this topic? Frequency tells the number of waves passing a point per minute.

What is amplitude of a transverse wave?

Amplitude is the maximum displacement of a wave from its rest position. The wavelength is the distance between two adjacent crests or troughs in a wave. The image shows the crest, trough, wavelength, and amplitude of a transverse wave. Waves are described in terms of its wavelength, amplitude and frequency.

What are the two physical characteristics of a wave?

Two physical characteristics of a wave are amplitude and wavelength. The amplitude of a wave is the height of a wave as measured from the highest point on the wave ( peak or crest) to the lowest point on the wave ( trough ). Wavelength refers to the length of a wave from one peak to the next.