EEG

Question 1

What frequency are alpha waves?

Answer 1

8-12 Hz

Question 2

When are alpha waves typically seen?

Answer 2

Awake but eyes closed

Question 3

What frequency are beta waves?

Answer 3

13-30 Hz

Question 4

When are beta waves typically seen?

Answer 4

• Awake and attentive with eyes open

- REM sleep

Question 5

What frequency are gamma waves?

Answer 5

> 30 Hz

Question 6

When are gamma waves typically seen?

Answer 6

Wide-awake and concentrating

Question 7

What frequency are delta waves?

Answer 7

0.1-4 Hz

Question 8

When are delta waves typically seen?

Answer 8

Stage IV of NREM sleep

Question 9

What frequency are theta waves?

Answer 9

4-8 Hz

Question 10

When are theta waves typically seen?

Answer 10

Stage and II of NREM sleep

Question 11

When are Vertex waves (V waves) seen on EEG?

Answer 11

Stage 1 of REM sleep

Question 12

When are sleep spindles seen on EEG?

Answer 12

Stages 2-4 of NREM sleep

Question 13

When are K complexes seen on EEG?

Answer 13

Stages 2-4 of NREM sleep

Question 14

When is slow activity seen on EEG?

Answer 14

Nonspecific sign of disturbed brain function

Question 15

When are paroxysmal discharges seen on EEG?

Answer 15

Epileptiform discharge

Question 16

When are sharp waves (rising between 70-200 ms) seen on EEG?

Answer 16

Interictal epileptiform discharge

Question 17

When are spikes (sloped peak of <70 ms) seen on ECG?

Answer 17

Interictal epileptiform discharge

Question 18

When is spike and wave activity at a frequency of 3/s seen on EEG?

Answer 18

• Absence seizures

- Myoclonic twitches

Question 19

When is spike and wave activity at a frequency of <3/s seen on EEG?

Answer 19

Lennox-Gastaut syndrome

Question 20

When are polyspikes and polyspike-wave complexes seen on EEG?

Answer 20

• Generalised epilepsy
• Juvenile myoclonic epilepsy
• Progressive myoclonic epilepsies
• Absence seizures

Question 21

When are periodic sharp wave complexes (frequency of 1-2 Hz) seen on EEG?

Answer 21

Early stages of sporadic CJD

Question 22

When are hypsarrhythmias seen on EEG?

Answer 22

West syndrome (Infantile spasms)