EEG Basic Terms 2

Question 1

Periodic

Answer 1

Single wave and complexes that repeat at intervals longer than the wavelength (space in between each other burst).

Question 2

Amplitude

Answer 2

How Big/tall an EEG waveform is. It is measured in mm and can be converted to voltage by multiplying the mm.

Question 3

Diffuse

Answer 3

Widespread or generalized, appearing all over the scalp

Question 4

Lateralized

Answer 4

Appearing on one side of the head (focal)

Question 5

Focal

Answer 5

Activity restricted to one or a few electrodes over an area of the head

Question 6

Synchronous

Answer 6

Two events occurring at the same time

Question 7

Sporadic

Answer 7

irregular and infrequent occurrence wave

Question 8

Reactivity

Answer 8

refers to changes in EEG pattern produced by some maneuvers such as eye opening. It can also be called Blocking Attenuation

Question 9

V-waves- vertex sharp wave-

Answer 9

normal sharp waves with negative polarity that phase reverse at Cz during II sleep

Question 10

Beech rhythm

Answer 10

this an activity seen after a patient has had brain surgery and a piece of their skull was removed for surgery and then re[laced again. When doing the EEG it creates a notchy, saw-toothed looking waveform that is mixture of low amplitudes waves over the intact bone and high amplitude waves coming through the crack in the bone.

Question 11

Posterior Slow wave of youth (PSWY)

Answer 11

these are slow waves (2-3HZ) that appear in kids in the posterior area during drowsiness. They can be between 5-20 years old but more prominent in 5 to 12 years old.

Question 12

Positive Occipital sharp Transient of Sleep

Answer 12

Appear during drowsiness and light sleep.
They are positive in polarity, can be bi or unilateral, are sharps in appearance and are of moderate amplitude